What Is the War Powers Act
The War Powers Act is the 1973 law that limits how long a president can keep U.S. troops in a fight Congress has not approved. Its formal name is the War Powers Resolution. It requires the president to report to Congress within 48 hours of sending forces into hostilities and to bring them home within 60 days unless Congress authorizes the mission.
Congress decides whether the country goes to war. The War Powers Act was its attempt, after Vietnam, to make that stick.
Key facts
- Congress passed the law over President Nixon’s veto on November 7, 1973 (CRS).
- Presidents have sent 135 public 48-hour reports since 1975. Only one cited the section that starts the 60-day clock (Reporting Project).
- Congress has held 31 floor votes on war powers resolutions since 2025. The sponsors won six.
- Two resolutions to end a war have passed both chambers and reached the president. Both were vetoed, in 2019 and 2020.
- The 2001 authorization for the war on terror is still in force after 25 years (U.S. Code).
Congress has two tools here, and they are easy to confuse. The War Powers Act is the standing law. A war powers resolution is a single bill, filed under that law, that orders troops out of one conflict. Most of the 2026 votes on Iran were votes on resolutions like these.
The law names three cases in which a president may send forces into hostilities: a declaration of war, a specific authorization passed by Congress, or a national emergency caused by an attack on the United States (50 U.S.C. 1541). Every president since Nixon has called central parts of the law unconstitutional (CRS).
How the War Powers Act’s 60-Day Clock Works
The law runs on a clock, and the clock only starts when the president files a particular kind of report.
The War Powers Act, step by step
- Before Consult Congress The president must consult Congress "in every possible instance" before sending forces into hostilities.
- Within 48 hours Report in writing A written report goes to the Speaker of the House and the Senate president pro tempore, saying why, under what authority, and for how long.
- Day 60 Stop unless Congress approves Forces must be withdrawn unless Congress declared war, authorized the mission, or extended the deadline by law.
- Up to day 90 Time to withdraw safely The president may take 30 more days, only if he certifies they are needed to bring the troops home safely.
- Any time Congress orders them out Congress can vote to direct the troops home. Whether that vote binds the president is disputed, as the June 2026 vote showed.
Source: 50 U.S.C. 1542-1544 and CRS Report R42699.
The 60 days run from the date a report “is submitted or is required to be submitted” under one section of the law, section 4(a)(1), which covers hostilities or clearly imminent hostilities (CRS). Two other kinds of report, for sending troops equipped for combat or for enlarging a force already abroad, do not start the clock.
That detail is where the law’s strength goes. A report that describes fighting but cites a different section, or says only that it is “consistent with” the War Powers Act, leaves the start date open to argument.
Why the War Powers Clock Rarely Starts
Nearly half of all 48-hour reports describe fighting, and only one has ever cited the section that starts the clock. The chart shows every public report since 1975, one dot each, from the War Powers Resolution Reporting Project at NYU’s Reiss Center on Law and Security.
- No fighting described, or unclear 73
- Described fighting, cited another section or none 61
- Cited the clock-starting section (the 1975 Mayaguez report) 1
Reports pile up in the 1990s Balkan missions, in 2014 as strikes on ISIS began in Iraq and Syria, and again since 2023. The red dot never repeats after 1975.
Source: War Powers Resolution Reporting Project, Reiss Center on Law and Security, NYU School of Law (48-hour reports dataset, current through July 10, 2026). Fighting coded by the project from each report's text. Classified reports are not included.
| Year | Event | Category |
|---|---|---|
| 1975 | 1975-04-04: Ford, South Vietnam | No fighting described, or unclear |
| 1975 | 1975-04-12: Ford, Cambodia | No fighting described, or unclear |
| 1975 | 1975-04-30: Ford, South Vietnam | Described fighting, cited another section or none |
| 1975 | 1975-05-15: Ford, Cambodia | Cited the clock-starting section (the 1975 Mayaguez report) |
| 1980 | 1980-04-26: Carter, Iran | No fighting described, or unclear |
| 1982 | 1982-03-19: Reagan, Israel, Egypt | No fighting described, or unclear |
| 1982 | 1982-08-24: Reagan, Lebanon | No fighting described, or unclear |
| 1982 | 1982-09-29: Reagan, Lebanon | No fighting described, or unclear |
| 1983 | 1983-08-08: Reagan, Chad | No fighting described, or unclear |
| 1983 | 1983-08-30: Reagan, Lebanon | Described fighting, cited another section or none |
| 1983 | 1983-10-25: Reagan, Grenada | No fighting described, or unclear |
| 1986 | 1986-03-26: Reagan, Gulf of Sidra | Described fighting, cited another section or none |
| 1986 | 1986-04-16: Reagan, Libya | Described fighting, cited another section or none |
| 1987 | 1987-09-24: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1987 | 1987-10-10: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1987 | 1987-10-20: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1988 | 1988-04-19: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1988 | 1988-07-04: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1988 | 1988-07-14: Reagan, Persian Gulf | Described fighting, cited another section or none |
| 1989 | 1989-12-02: H.W. Bush, Philippines | Described fighting, cited another section or none |
| 1989 | 1989-12-21: H.W. Bush, Panama | Described fighting, cited another section or none |
| 1990 | 1990-08-06: H.W. Bush, Liberia | No fighting described, or unclear |
| 1990 | 1990-08-09: H.W. Bush, Saudi Arabia, Iraq | No fighting described, or unclear |
| 1990 | 1990-11-16: H.W. Bush, Persian Gulf | No fighting described, or unclear |
| 1991 | 1991-01-18: H.W. Bush, Iraq, Kuwait | Described fighting, cited another section or none |
| 1992 | 1992-12-10: H.W. Bush, Somalia | No fighting described, or unclear |
| 1993 | 1993-04-13: Clinton, Bosnia and Herzegovina | Described fighting, cited another section or none |
| 1993 | 1993-06-28: Clinton, Iraq | Described fighting, cited another section or none |
| 1993 | 1993-07-09: Clinton, Former Yugoslav Republic of Macedonia | No fighting described, or unclear |
| 1993 | 1993-10-20: Clinton, Haiti | No fighting described, or unclear |
| 1994 | 1994-02-17: Clinton, Bosnia and Herzegovina | No fighting described, or unclear |
| 1994 | 1994-03-01: Clinton, Bosnia and Herzegovina | Described fighting, cited another section or none |
| 1994 | 1994-04-12: Clinton, Bosnia and Herzegovina | Described fighting, cited another section or none |
| 1994 | 1994-04-12: Clinton, Burundi | No fighting described, or unclear |
| 1994 | 1994-04-19: Clinton, Former Yugoslav Republic of Macedonia | No fighting described, or unclear |
| 1994 | 1994-08-01: Clinton, Rwanda | No fighting described, or unclear |
| 1994 | 1994-08-22: Clinton, Bosnia and Herzegovina | Described fighting, cited another section or none |
| 1994 | 1994-09-21: Clinton, Haiti | No fighting described, or unclear |
| 1994 | 1994-11-22: Clinton, Bosnia and Herzegovina, Croatia | Described fighting, cited another section or none |
| 1995 | 1995-03-01: Clinton, Somalia | No fighting described, or unclear |
| 1995 | 1995-09-01: Clinton, Bosnia and Herzegovina | Described fighting, cited another section or none |
| 1995 | 1995-12-06: Clinton, Bosnia and Herzegovina, Croatia, Hungary, Italy | No fighting described, or unclear |
| 1995 | 1995-12-21: Clinton, Bosnia and Herzegovina, Croatia, Hungary, Italy | No fighting described, or unclear |
| 1996 | 1996-04-11: Clinton, Liberia, Sierra Leone, Senegal | Described fighting, cited another section or none |
| 1996 | 1996-05-20: Clinton, Liberia | Described fighting, cited another section or none |
| 1996 | 1996-05-23: Clinton, Central African Republic | No fighting described, or unclear |
| 1996 | 1996-12-02: Clinton, Rwanda, Republic of Zaire, Uganda | No fighting described, or unclear |
| 1997 | 1997-03-15: Clinton, Albania | No fighting described, or unclear |
| 1997 | 1997-03-27: Clinton, Gabon, Republic of the Congo | No fighting described, or unclear |
| 1997 | 1997-05-30: Clinton, Sierra Leone | No fighting described, or unclear |
| 1997 | 1997-07-11: Clinton, Thailand | No fighting described, or unclear |
| 1998 | 1998-06-12: Clinton, Senegal | No fighting described, or unclear |
| 1998 | 1998-08-10: Clinton, Kenya, Tanzania | No fighting described, or unclear |
| 1998 | 1998-08-18: Clinton, Albania | No fighting described, or unclear |
| 1998 | 1998-08-21: Clinton, Afghanistan, Sudan (Pre-Separation) | Described fighting, cited another section or none |
| 1998 | 1998-09-29: Clinton, Liberia, Sierra Leone | No fighting described, or unclear |
| 1999 | 1999-03-26: Clinton, Federal Republic of Yugoslavia, Former Yugoslav Republic of Macedonia | Described fighting, cited another section or none |
| 1999 | 1999-04-07: Clinton, Albania, Former Yugoslav Republic of Macedonia | No fighting described, or unclear |
| 1999 | 1999-05-25: Clinton, Albania | Described fighting, cited another section or none |
| 1999 | 1999-06-12: Clinton, Kosovo | No fighting described, or unclear |
| 1999 | 1999-10-08: Clinton, East Timor, Indonesia | No fighting described, or unclear |
| 2000 | 2000-02-25: Clinton, East Timor | No fighting described, or unclear |
| 2000 | 2000-05-12: Clinton, Sierra Leone | No fighting described, or unclear |
| 2000 | 2000-10-14: Clinton, Yemen | No fighting described, or unclear |
| 2001 | 2001-09-24: W. Bush, Central and Pacific Command | No fighting described, or unclear |
| 2001 | 2001-10-09: W. Bush, Afghanistan | Described fighting, cited another section or none |
| 2002 | 2002-09-26: W. Bush, Cote d'Ivoire | No fighting described, or unclear |
| 2003 | 2003-03-21: W. Bush, Iraq | Described fighting, cited another section or none |
| 2003 | 2003-06-09: W. Bush, Liberia, Mauritania, Senegal, Sierra Leone | No fighting described, or unclear |
| 2003 | 2003-08-13: W. Bush, Liberia | No fighting described, or unclear |
| 2004 | 2004-02-25: W. Bush, Haiti | No fighting described, or unclear |
| 2004 | 2004-03-02: W. Bush, Haiti | No fighting described, or unclear |
| 2006 | 2006-07-18: W. Bush, Lebanon | No fighting described, or unclear |
| 2011 | 2011-03-21: Obama, Libya | Described fighting, cited another section or none |
| 2011 | 2011-10-14: Obama, Uganda, South Sudan, Central African Republic, Democratic Republic of the Congo | No fighting described, or unclear |
| 2012 | 2012-01-26: Obama, Somalia | No fighting described, or unclear |
| 2012 | 2012-09-14: Obama, Libya, Yemen | No fighting described, or unclear |
| 2012 | 2012-12-29: Obama, Central African Republic, Chad | No fighting described, or unclear |
| 2013 | 2013-01-13: Obama, Somalia | No fighting described, or unclear |
| 2013 | 2013-02-22: Obama, Niger | No fighting described, or unclear |
| 2013 | 2013-06-21: Obama, Jordan | No fighting described, or unclear |
| 2013 | 2013-12-19: Obama, South Sudan | No fighting described, or unclear |
| 2013 | 2013-12-22: Obama, South Sudan | No fighting described, or unclear |
| 2014 | 2014-03-25: Obama, South Sudan, Central African Republic, Democratic Republic of the Congo, Uganda | No fighting described, or unclear |
| 2014 | 2014-05-21: Obama, Chad | No fighting described, or unclear |
| 2014 | 2014-06-16: Obama, Iraq | No fighting described, or unclear |
| 2014 | 2014-06-26: Obama, Iraq | No fighting described, or unclear |
| 2014 | 2014-06-30: Obama, Iraq | No fighting described, or unclear |
| 2014 | 2014-07-27: Obama, Libya, Tunisia | No fighting described, or unclear |
| 2014 | 2014-08-08: Obama, Iraq | Described fighting, cited another section or none |
| 2014 | 2014-08-17: Obama, Iraq | Described fighting, cited another section or none |
| 2014 | 2014-09-01: Obama, Iraq | Described fighting, cited another section or none |
| 2014 | 2014-09-05: Obama, Iraq | No fighting described, or unclear |
| 2014 | 2014-09-08: Obama, Iraq | Described fighting, cited another section or none |
| 2014 | 2014-09-11: Obama, Central African Republic | No fighting described, or unclear |
| 2014 | 2014-09-23: Obama, Syria | Described fighting, cited another section or none |
| 2014 | 2014-09-23: Obama, Syria, Iraq | Described fighting, cited another section or none |
| 2015 | 2015-10-14: Obama, Cameroon | No fighting described, or unclear |
| 2016 | 2016-07-13: Obama, South Sudan | No fighting described, or unclear |
| 2016 | 2016-07-15: Obama, Uganda | No fighting described, or unclear |
| 2016 | 2016-10-14: Obama, Yemen | Described fighting, cited another section or none |
| 2017 | 2017-04-08: Trump, Syria | Described fighting, cited another section or none |
| 2018 | 2018-04-15: Trump, Syria | Described fighting, cited another section or none |
| 2019 | 2019-01-04: Trump, Gabon | No fighting described, or unclear |
| 2019 | 2019-11-19: Trump, Saudi Arabia | No fighting described, or unclear |
| 2020 | 2020-11-01: Trump, Nigeria | No fighting described, or unclear |
| 2021 | 2021-02-27: Biden, Syria | Described fighting, cited another section or none |
| 2021 | 2021-06-29: Biden, Syria, Iraq | Described fighting, cited another section or none |
| 2022 | 2022-08-25: Biden, Syria | Described fighting, cited another section or none |
| 2023 | 2023-03-25: Biden, Syria | Described fighting, cited another section or none |
| 2023 | 2023-04-23: Biden, Djibouti, Ethiopia, Sudan | No fighting described, or unclear |
| 2023 | 2023-10-27: Biden, Syria | Described fighting, cited another section or none |
| 2023 | 2023-11-10: Biden, Syria | Described fighting, cited another section or none |
| 2023 | 2023-11-14: Biden, Syria | Described fighting, cited another section or none |
| 2023 | 2023-11-22: Biden, Iraq | Described fighting, cited another section or none |
| 2023 | 2023-12-27: Biden, Iraq | Described fighting, cited another section or none |
| 2024 | 2024-01-05: Biden, Unknown | No fighting described, or unclear |
| 2024 | 2024-01-12: Biden, Yemen | Described fighting, cited another section or none |
| 2024 | 2024-01-24: Biden, Yemen | Described fighting, cited another section or none |
| 2024 | 2024-01-25: Biden, Iraq | Described fighting, cited another section or none |
| 2024 | 2024-02-04: Biden, Iraq, Syria | Described fighting, cited another section or none |
| 2024 | 2024-02-05: Biden, Yemen | Described fighting, cited another section or none |
| 2024 | 2024-02-26: Biden, Yemen | Described fighting, cited another section or none |
| 2024 | 2024-03-14: Biden, Haiti | No fighting described, or unclear |
| 2024 | 2024-10-15: Biden, Israel | No fighting described, or unclear |
| 2025 | 2025-03-28: Trump, Yemen | Described fighting, cited another section or none |
| 2025 | 2025-06-23: Trump, Iran | Described fighting, cited another section or none |
| 2025 | 2025-09-02: Trump, Haiti | No fighting described, or unclear |
| 2025 | 2025-09-04: Trump, Caribbean Sea | Described fighting, cited another section or none |
| 2026 | 2026-01-05: Trump, Venezuela | Described fighting, cited another section or none |
| 2026 | 2026-03-02: Trump, Iran | Described fighting, cited another section or none |
| 2026 | 2026-03-09: Trump, Ecuador | Described fighting, cited another section or none |
| 2026 | 2026-06-12: Trump, Iran | Described fighting, cited another section or none |
| 2026 | 2026-06-29: Trump, Iran | Described fighting, cited another section or none |
| 2026 | 2026-07-10: Trump, Iran | Described fighting, cited another section or none |
Presidents of both parties avoid the clock the same way. They send the report, describe the mission, and cite their own power as commander in chief rather than the section Congress wrote. 124 of the 135 public reports rest on that constitutional power alone, according to the project’s coding.
The 2026 Iran war followed the pattern. U.S. and Israeli strikes began on February 28, and the White House filed its report on March 2 (Reporting Project). By the law’s count that set May 1 as the deadline, according to Lawfare’s Scott Anderson. President Trump called a 60-day limit on him “totally unconstitutional.”
From Vietnam to Iran, the War Powers Record
The law came out of Vietnam, a war Congress authorized in 1964 and never declared. Its record since 1973 runs through three kinds of test.
Congress has tried to use the law, in Lebanon in 1983, Yemen in 2019, Iran in 2020 and Iran again in 2026. Presidents have argued their way around it, most clearly over Libya in 2011. The Supreme Court weakened one of its tools in 1983, and Congress repealed two old war authorizations in 2025.
- Congress overrides Nixon The War Powers Act becomes law on November 7.
- Congress starts the clock for Lebanon The only time Congress set the clock itself, then authorized 18 months.
- Chadha ruling The Supreme Court strikes a legislative veto, casting doubt on the law's concurrent-resolution tool.
- Libya "not hostilities" The administration says an air campaign past 60 days does not trigger the limit.
- Yemen resolution vetoed Passes both chambers, then vetoed. Override fails 53-45.
- Iran resolution vetoed Passes both chambers, then vetoed. Override fails 49-44.
- Two Iraq authorizations repealed The 1991 and 2002 Iraq war authorizations end on December 18.
- Congress orders troops out of Iran Both chambers adopt H.Con.Res. 86. It is never sent to the president.
Sources: CRS Report R42699; govinfo bill status for S.J.Res. 7 (2019), S.J.Res. 68 (2020) and H.Con.Res. 86 (2026); U.S. Code notes to 50 U.S.C. 1541.
The War Powers Act, from Vietnam to Iran: 1973: Congress overrides Nixon (The War Powers Act becomes law on November 7.). 1983: Congress starts the clock for Lebanon (The only time Congress set the clock itself, then authorized 18 months.). 1983: Chadha ruling (The Supreme Court strikes a legislative veto, casting doubt on the law's concurrent-resolution tool.). 2011: Libya "not hostilities" (The administration says an air campaign past 60 days does not trigger the limit.). 2019: Yemen resolution vetoed (Passes both chambers, then vetoed. Override fails 53-45.). 2020: Iran resolution vetoed (Passes both chambers, then vetoed. Override fails 49-44.). 2025: Two Iraq authorizations repealed (The 1991 and 2002 Iraq war authorizations end on December 18.). 2026: Congress orders troops out of Iran (Both chambers adopt H.Con.Res. 86. It is never sent to the president.).
1973: Congress passed the War Powers Act over President Nixon’s October 24 veto, and it became law on November 7 (CRS). Nixon called it an unconstitutional attempt to take powers presidents had used “for almost 200 years.”
1983: For the Multinational Force in Lebanon, Congress used the law to declare that the clock had started on August 29, then authorized the Marines to stay 18 months (P.L. 98-119). It is the only time Congress has started the clock itself. In June of that year, INS v. Chadha struck down a one-house veto in immigration law. The ruling cast doubt on any congressional veto the president never gets to sign, which includes the War Powers Act’s concurrent resolution (CRS).
2011: U.S. forces joined the NATO air campaign in Libya in March. Past the 60-day mark, the Obama administration told Congress that its “constrained and supporting role” did not amount to “hostilities” under the law (CRS).
2019 and 2020: Congress passed S.J.Res. 7, ending U.S. support for the Saudi-led war in Yemen, and S.J.Res. 68, barring hostilities against Iran without approval. These were joint resolutions, which go to the president. President Trump vetoed both, and the Senate fell short of the two-thirds needed to override, 53-45 and 49-44.
2025: The defense bill signed on December 18 repealed the 1991 Gulf War authorization and the 2002 Iraq War authorization (P.L. 119-60, section 8370).
2026: The House adopted H.Con.Res. 86 on June 3, 215-208, and the Senate agreed on June 23, 50-48. It directs the president to remove U.S. forces from hostilities with Iran. PBS NewsHour reported it was the first time both chambers had approved such a measure since the law took effect.
Authorizations for Use of Military Force Outlast the Wars
The other way a war becomes legal is a vote to authorize it, and those votes can last decades longer than the wars they named. An authorization for use of military force, or AUMF, is a law that satisfies the War Powers Act, so no 60-day clock runs against it.
| Item | Began | Ended | Length |
|---|---|---|---|
| Gulf of Tonkin Resolution (Vietnam), P.L. 88-408 | August 10, 1964 | 1971 | 6 years |
| Gulf War authorization (Iraq, 1991), P.L. 102-1 | January 14, 1991 | December 18, 2025 | 34 years |
| Post-9/11 authorization (2001 AUMF), P.L. 107-40 | September 18, 2001 | Still in force on September 25, 2026 | 25 years |
| Iraq War authorization (2002), P.L. 107-243 | October 16, 2002 | December 18, 2025 | 23 years |
Source: U.S. Code statutory notes to 50 U.S.C. 1541 (enactment and repeal dates, current through September 25, 2026); CRS Report R42699 (Gulf of Tonkin repeal, 1971).
The 2001 authorization is the open bar. It lets the president use force against the “nations, organizations, or persons he determines planned, authorized, committed, or aided” the September 11 attacks, with no end date. By 2021 it had been cited to justify counterterrorism operations in 22 countries, according to Brown University’s Costs of War project, including against groups that did not exist in 2001. Our AUMF explainer covers who the 2001 authorization reaches now and what it was used for in 2025.
The two Iraq authorizations stayed in force 34 and 23 years before the December 2025 repeal. For the Iran war, the administration has not pointed to the 2001 authorization or any other law. Its March 2026 report cited only the president’s constitutional power (Reporting Project).
The 2025-2026 War Powers Votes
Congress voted on war powers 31 times in the 119th Congress through September 24, 2026, and 8 of the losses came down to one vote or a tie.
- 31
- Floor votes on war powers resolutions since January 2025
- 6
- Votes the sponsors won, across Venezuela and Iran
- 8
- Losses by a single vote or a tie
The House came closest on ties: 215-215 on Venezuela in January and 212-212 on Iran in May (Clerk). In the Senate, Vice President Vance broke a 50-50 tie on January 14 to strip a Venezuela resolution of its fast-track status (Senate). Most Senate votes were on motions to pull a resolution out of committee, which is why the same Iran question came up 17 times there this year.
The Senate’s June 23 vote made H.Con.Res. 86 the first concurrent resolution of this war adopted by both chambers. A concurrent resolution does not go to the president, which keeps it veto-proof but, after Chadha, of doubtful legal force. A White House official told reporters that the April ceasefire had left no hostilities to withdraw from. U.S. strikes on Iranian coastal sites followed within days, and the White House filed new 48-hour reports on June 29 and July 10 (Reporting Project).
The human cost has kept rising. By July 19, 17 U.S. service members had been killed, according to U.S. Central Command figures reported by Al Jazeera, and by August 19 the Pentagon counted more than 750 wounded (CNN).
Where the War Powers Fights Stand
As of September 26, 2026
- War Powers Act (1973) Law, presidents dispute it
President Trump called its 60-day limit "totally unconstitutional" in May 2026. (source)
- 2001 AUMF Law, no end date
Left in place when Congress repealed the Iraq authorizations on December 18, 2025. (source)
- 1991 and 2002 Iraq AUMFs Ended, repealed
Repealed by section 8370 of the defense bill signed December 18, 2025 (P.L. 119-60). (source)
- H.Con.Res. 86, Iran Ended, adopted, not binding
Adopted by the Senate June 23, 2026. Never sent to the president. (source)
- H.Con.Res. 89, Iran Ended, failed in the Senate
Passed the House July 23, then failed in the Senate 49-50 on September 24, 2026. (source)
- H.Con.Res. 93, Iran Proposal, passed the House
Passed the House 220-204 on September 15, 2026, and was referred to the Senate Foreign Relations Committee on September 16. (source)
- Venezuela resolutions Ended, failed
The Senate stripped S.J.Res. 98 of fast-track status 51-50 on January 14; the House tied 215-215 on January 22. (source)
Source: Senate and House roll call records; govinfo bill status; U.S. Code notes to 50 U.S.C. 1541
The House also rejected two resolutions on U.S. forces in Lebanon in June, and the Senate kept a Cuba resolution off the fast track on April 28, 51-47 (Senate). The same four Republican senators, Rand Paul, Susan Collins, Lisa Murkowski and Bill Cassidy, supplied the margin on the Senate’s two Iran wins in May and June.
The Honest Disagreement Over War Powers
Presidents of both parties have argued that the War Powers Act cuts into their power as commander in chief. Nixon’s veto message made that case in 1973, and the same argument ran through the Libya campaign in 2011 and the Iran war in 2026. Supporters of broad presidential power add that 60 days is too short for some missions and that the law’s timeline tells an enemy how long to wait (CRS).
Members of Congress who back the law answer that the Constitution gives Congress, not the president, the power to declare war, and that the 60-day clock is the only way to make that power work once troops are already deployed. Sen. Susan Collins said in April 2026 that the deadline is “not a suggestion; it is a requirement”.
Courts have mostly stayed out. In 1987, 111 members of Congress sued to force a War Powers report on Persian Gulf tanker escorts, and a federal judge dismissed the case as a political question. Rep. Tom Campbell’s suit over the 1999 Kosovo air war also failed (CRS). That leaves Congress’s main power where it has always been: votes on authorizations and on the money that pays for the war.
What the War Powers Act Does Not Do
- It does not give the president permission to fight for 60 days. The law says so in its own text: nothing in it grants authority the president did not already have (50 U.S.C. 1547).
- It does not cover every deployment. Training missions and supply operations are not hostilities, and most 48-hour reports describe no fighting at all.
- It is not a declaration of war. Congress last declared war on June 4, 1942, against Bulgaria, Hungary and Romania (Senate). Every U.S. war since then has run on an authorization or on no vote at all.
- Paying for a war is not approving it. A spending bill counts as authorization only if it says so in specific terms (50 U.S.C. 1547).
Frequently Asked Questions
Can the president start a war without Congress?
The Constitution gives Congress the power to declare war. Presidents have sent forces into combat without a vote many times, relying on their power as commander in chief. The War Powers Act limits any use of force Congress has not approved to 60 days, plus 30 more to withdraw.
Can the president veto a war powers resolution?
Yes, if it is a joint resolution. President Trump vetoed the Yemen resolution in 2019 and the Iran resolution in 2020, and the Senate could not reach the two-thirds needed to override. A concurrent resolution never goes to the president, but after the Supreme Court’s 1983 Chadha ruling, its legal force is in doubt.
Did Obama violate the War Powers Act in Libya?
Ten House members said so in a lawsuit. U.S. forces stayed in the 2011 Libya campaign past 60 days without a vote, and the administration told Congress that its “constrained and supporting role” was not “hostilities” under the law. A federal judge dismissed the suit in October 2011 because the members lacked standing, so no court ruled on the question.
What is the difference between the War Powers Act and an AUMF?
The War Powers Act is the general rule for any use of force Congress has not approved. An authorization for use of military force is Congress’s approval for a specific conflict, so the War Powers Act’s 60-day limit does not apply to it.
What You Can Do
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Ask your senators to vote for H.Con.Res. 93. The House passed it 220-204 on September 15, and it is now in the Senate Foreign Relations Committee. Ask whether your senators will vote to bring it to the floor.
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Check how your members voted. Every Senate roll call is on senate.gov and every House vote on the House Clerk’s site. Thank the ones who voted to enforce the law, and ask the others why they did not.
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Ask for a vote on the 2001 AUMF. It has no end date after 25 years. Ask your representative whether they would support a sunset date so Congress has to vote again.
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Read the related powers. A president can also act alone through national emergencies, the Insurrection Act at home, and withholding money Congress approved. Congress’s ultimate check is impeachment.
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Send the letter below. It asks your members of Congress to vote for a war powers resolution that ends U.S. hostilities against Iran unless Congress authorizes them.