What Is Habeas Corpus
Habeas corpus is the right to make the government prove to a judge that it has legal authority to hold you. If the government cannot justify the detention, the judge can order you released. It is not a criminal trial or an appeal, and it protects citizens and noncitizens alike.
Key facts
- Immigration habeas petitions reached 31,357 from October 2025 to March 2026 (TRAC).
- Judges ruled more than 4,400 times by February 2026 that ICE held someone unlawfully (Newsweek).
- Nine federal appeals courts have found ICE’s no-bond policy unlawful, and two have upheld it (ACLU).
- ICE held 65,765 people on July 11, 2026, and 70.6% had no criminal conviction (TRAC).
- Only Congress can suspend the writ, and only “in Cases of Rebellion or Invasion” (Article I).
The Latin phrase means “you have the body.” A habeas petition orders whoever holds a person to bring them before a court and state the legal basis for holding them. English judges used the writ for centuries, and Parliament strengthened it in the Habeas Corpus Act of 1679. The framers wrote it into the Constitution before the Bill of Rights existed.
Habeas is narrow on purpose. It does not decide guilt or immigration status, and it does not promise release. It asks one question: does the government have legal authority to hold this person right now?
How a Habeas Petition Works
Rümeysa Öztürk’s case shows the process from the first hour. She was a Turkish graduate student at Tufts, in the country on a student visa. On March 25, 2025, according to the Second Circuit’s opinion, “six heavily armed, plainclothes officers, some masked,” arrested her on the street near her home and drove her away in an unmarked car.
They took her to New Hampshire, then Vermont, and the next day flew her to a jail in Basile, Louisiana. She could not speak to a lawyer or tell anyone where she was for almost 24 hours. Her lawyers could not find her, so that evening they filed a habeas petition in Massachusetts, her last known location. The court later moved the case to Vermont, where she had been when they filed.
On May 9, 2025, Judge William Sessions held a hearing and ordered her released immediately, 45 days after her arrest.
The law sets a fast clock for every case like hers. Judges can extend it for good cause, and in immigration cases they often do.
How a federal habeas petition moves through court
- Day 1 The petition is filed The detained person, or someone acting for them, files in federal court where the person is held and names the official holding them.
- Right away The judge orders an answer The court issues the writ or an order to show cause "forthwith," unless the petition shows no right to relief.
- Within 3 days The government states its authority The official holding the person must certify "the true cause of the detention." A judge can allow up to 20 days.
- Within 5 more days The hearing The government must bring the person to court unless only legal questions are in dispute.
- After the hearing Release or another order The judge rules "as law and justice require": release, a bond hearing, a bar on transfer, or denial.
Source: 28 U.S.C. 2242 and 2243, via Cornell LII.
The deadlines are in 28 U.S.C. 2243. The rule that anyone “acting in his behalf” can file, so a detained person does not have to do it alone, is in section 2242.
If Someone You Love Is Detained
What to do, by situation
Open the situation closest to yours. This is general information, not legal advice. The Immigration Advocates Network directory lists free and low-cost immigration lawyers by state.
ICE just detained someone I love
- Find where they are held with ICE's Online Detainee Locator, using their name and country of birth or their A-number.
- Call a lawyer from the Immigration Advocates Network directory or the National Immigrant Justice Center.
- Tell the lawyer where and when the arrest happened. A petition is filed where the person is held, and ICE can move people between states.
- Gather papers that show how long they have lived here, any past court orders, and any bond decision.
Federal law lets someone "acting in his behalf" file the petition (28 U.S.C. 2242), so the case can start while the person is out of reach.
We cannot find where they are being held
- Keep checking the ICE locator, and write down each time you check.
- Ask the lawyer about filing in the district of their last known location, as Öztürk's lawyers did.
- Save anything that shows where they were taken and when: calls, texts, or witness accounts.
Öztürk's petition was filed in Massachusetts while she was in transit. The court moved it to Vermont and kept the case alive.
An immigration judge denied bond or said there could be no bond hearing
- Ask the lawyer whether a habeas petition fits. Most federal appeals courts have now ruled that people arrested inside the country are owed a bond hearing.
- Check which circuit covers the state where the person is held. The answer changes by circuit.
See bond hearings by circuit below.
A judge ordered release, but they are still held
- Tell the lawyer right away. The lawyer can ask the court to enforce its own order.
- Keep a dated record of every contact with the detention center after the order.
In January 2026, Minnesota's chief federal judge found ICE had violated 96 court orders in a single month.
I want to challenge a state criminal conviction
- Talk to a post-conviction lawyer soon. Federal law sets a one-year deadline, which usually starts when the conviction becomes final.
- Raise the claims in state court first. Federal courts generally require that before they will hear a petition.
The deadline is in 28 U.S.C. 2244(d), and the state-court rule is in section 2254(b).
Why Habeas Petitions Surged in 2025 and 2026
Immigration habeas petitions were rare before 2025: TRAC counted 105 in March 2025. They multiplied after the government stopped giving bond hearings to most people ICE arrested inside the country.
The policy became formal in September 2025. In Matter of Yajure Hurtado, the Board of Immigration Appeals ruled that anyone who entered without inspection is still “seeking admission,” however long ago they arrived (CLINIC). Under that reading, the law requires detention and an immigration judge cannot set bond. With the immigration courts closed to bond requests, federal habeas was the only door left.
Monthly filings rose more than twelvefold in six months.
| Category | Value |
|---|---|
| Sep 2025 | 733 |
| Oct 2025 | 1392 |
| Nov 2025 | 2202 |
| Dec 2025 | 3642 |
| Jan 2026 | 6780 |
| Feb 2026 | 8282 |
| Mar 2026 | 9059 |
Source: TRAC, Table 1, from federal court records. TRAC's table misdates the January and February rows as 2025; the rows run in order from December 2025 to March 2026. March 2025 had 105 filings.
Filings reached 82 of the 90 federal districts TRAC tracks. The Western District of Texas led with 3,448 in six months, followed by the Eastern District of California and the Southern District of Texas.
When judges reviewed the detentions, they often found no legal basis for them. A Reuters review of court records, reported by Newsweek on February 14, 2026, counted at least 4,421 cases since early October in which more than 400 federal judges ruled that ICE was holding someone unlawfully.
In Michigan, more than 800 petitions had been filed by March 2026, most from the North Lake Processing Center, a privately run detention center in the northern part of the state. Michigan Public’s analysis found judges granted most of them and ordered bond hearings within days or release (Michigan Public).
Bond Hearings Depend on Where a Person Is Held
A habeas petition is filed where the person is detained, so the federal appeals court for that region sets the rule. As of September 2026, nine of those courts have rejected the no-bond policy and two have upheld it.
- Bond hearing owed (9 circuits) 1st, 2nd, 3rd, 4th, 6th, 7th, 9th, 10th, 11th
- Detention without bond upheld (2 circuits) 5th, 8th
- No ruling yet (1 circuit) D.C.
Status as of September 11, 2026. Sources: CLINIC circuit tracker; ACLU (September 10, 2026).
Which rule applies where a person is held. Status as of September 11, 2026.
Where it stands, October 2026:
- Granted, not yet argued. On October 1, 2026, the Supreme Court agreed to hear the government’s appeal of the Second Circuit ruling, Rhoney v. Barbosa da Cunha (No. 26-104). Petitions over the Sixth Circuit’s ruling and the Fifth Circuit’s were still pending (CLINIC).
- Set for argument October 13, 2026. On June 15, 2026, the Court agreed to decide, in Genalo v. Black, whether a person held under a different mandatory-detention law is owed a bond hearing once detention becomes “unreasonably prolonged.”
- Pending in the Fifth Circuit. The full court scheduled argument for September 24, 2026 in Sosnava Rodriguez v. Ortega, on whether the Constitution requires a bond hearing after 90 days even where the statute does not.
Texas and Louisiana sit in the Fifth Circuit, where the statute is read to deny these bond hearings and only constitutional challenges remain. Two of the three districts with the most habeas filings are in Texas.
The Alien Enemies Act Test
The sharpest test of habeas came from a 1798 wartime law. In March 2025 the administration invoked the Alien Enemies Act against men it accused of belonging to the Venezuelan gang Tren de Aragua, and flew some to a prison in El Salvador without hearings.
The Supreme Court answered by sending every challenge into habeas. On April 7, 2025, it ruled 5-4 in Trump v. J.G.G. that detainees had to file habeas petitions in the district where they were held, and that they were owed notice and a chance to file first. Justice Sotomayor, dissenting, noted that even the government now admitted the detainees were entitled to notice and review. “That should have been the end of the matter,” she wrote.
In May 2025 the Court held in A.A.R.P. v. Trump that about 24 hours of notice was not enough time to file. The Court has never decided whether the 1798 law covers these removals. What happened to the men already sent to El Salvador, and where their cases stand, is on our due process page.
The Four Times Habeas Was Suspended
The writ has been suspended only four times, each during a civil war, an armed insurrection, or an attack on American territory.
- Lincoln, then Congress Civil War. Lincoln suspended the writ first; Chief Justice Taney said he lacked the authority, and Congress authorized it in 1863.
- Grant, under an act of Congress Under the Ku Klux Klan Act, President Grant suspended the writ in nine South Carolina counties where he found the Klan active and powerful.
- Philippine governor Suspended in Cavite and Batangas, two provinces of the American-run Philippines, during armed unrest.
- Hawaii territorial governor After Pearl Harbor. The Supreme Court later held the military trials that followed were unlawful.
Sources: Cato Institute (2025); Grant's 1871 annual message; Fisher v. Baker (1906); Duncan v. Kahanamoku (1946).
Every suspension of habeas corpus in American history: 1861-65: Lincoln, then Congress (Civil War. Lincoln suspended the writ first; Chief Justice Taney said he lacked the authority, and Congress authorized it in 1863.). 1871: Grant, under an act of Congress (Under the Ku Klux Klan Act, President Grant suspended the writ in nine South Carolina counties where he found the Klan active and powerful.). 1905: Philippine governor (Suspended in Cavite and Batangas, two provinces of the American-run Philippines, during armed unrest.). 1941-44: Hawaii territorial governor (After Pearl Harbor. The Supreme Court later held the military trials that followed were unlawful.).
In 1861, Lincoln acted alone and Congress approved it two years later. In 1871, Grant acted under a law Congress had just passed (Grant’s annual message). In 1905 and 1941, territorial governors acted under laws Congress had written for the Philippines (Fisher v. Baker) and Hawaii. In Duncan v. Kahanamoku (1946), the Supreme Court held that Hawaii’s law never authorized replacing civilian courts with military trials.
None of the four involved immigration enforcement. In an April 2025 memo, White House staff secretary Will Scharf told the chief of staff that every earlier suspension had responded to war or armed rebellion (Reason).
Guantánamo and the Law-Free Zone
After 9/11, Congress took a different route. Instead of suspending the writ, the Military Commissions Act of 2006 tried to strip federal courts of the power to hear habeas petitions from detainees at Guantánamo Bay, on the theory that a base outside the United States was beyond the reach of American courts.
The Supreme Court rejected that in Boumediene v. Bush (2008). Detainees at Guantánamo have a constitutional right to habeas, and the government cannot create a law-free zone by holding people offshore. The case drew a line between suspending the writ, which the Constitution allows only in rebellion or invasion, and removing the courts’ power to hear petitions without a suspension.
Criminal Habeas and Immigration Habeas
The two kinds of habeas case work differently, which explains why immigration petitions succeed far more often than criminal ones.
Criminal habeas and immigration habeas are very different arenas.
Criminal habeas is hard by design. Under the 1996 Antiterrorism and Effective Death Penalty Act, a federal court usually cannot overturn a state conviction unless the state court ignored clearly established federal law. A federal study of non-capital cases filed in 2003 and 2004 found that only 7 of 1,986 completed cases received relief.
Immigration detention challenges have no such hurdle. When the government holds someone with no bond hearing and no clear legal basis, the question is simple: show the authority.
Who Can Suspend Habeas Corpus
The Suspension Clause sits in Article I, the part of the Constitution that lists Congress’s powers. For that reason, courts and scholars have long treated suspension as a power that belongs to Congress, not the president. When Lincoln suspended the writ on his own in 1861, Chief Justice Taney rejected the move.
The question returned on May 9, 2025, when White House adviser Stephen Miller said the administration was “actively looking at” suspending habeas corpus, arguing that illegal immigration counts as an “invasion.”
In June 2026, internal memos reported by the New York Times showed the idea had been debated more seriously than was known. White House staff secretary Will Scharf objected, and the proposal was set aside (Reason). As of September 2026, the writ has not been suspended.
The Honest Disagreement
Serious lawyers disagree about these detentions, and the fight runs along two lines that are easy to confuse. One is a policy question about who should be deported. The other is a legal question about how much a court gets to check the government first.
The administration’s case, adopted by the Fifth and Eighth Circuits, rests on the statute’s text. A person who entered without being admitted is legally an “applicant for admission,” the government argues, so the law requires detention wherever and whenever they are arrested. Judge Murphy of the Sixth Circuit, dissenting there, wrote that the other reading gives people who crossed unlawfully more protection than people stopped at the border.
Nine appeals courts read the same words the other way. A person living in the country for years is not “seeking admission,” they held, so the ordinary bond statute applies. The First Circuit pointed to history: “over three decades, five administrations implemented the disputed statutes just as we conclude today that their texts require” (CLINIC).
On suspension, Miller argues that mass migration is an “invasion.” Critics across the spectrum, including Georgetown Law’s Steve Vladeck and the libertarian Cato Institute, answer that courts have rejected that reading; Cato points to a Texas ruling that “surges in immigration do not constitute an ‘invasion’ within the meaning of the Constitution.” The Supreme Court has not resolved either question.
What Habeas Does Not Settle
Habeas is powerful, but it is not a cure-all, and overstating it invites easy pushback.
It does not decide guilt or immigration status. It decides only whether the detention itself is legal right now.
A win is not always freedom. A judge may order a bond hearing or block a transfer rather than order release.
It reaches less at the border. In DHS v. Thuraissigiam (2020), the Supreme Court held that a man stopped 25 yards past the border could not use habeas to get a new chance to apply for asylum.
It is slow under emergency-power claims. In the Alien Enemies Act cases, habeas slowed removals and forced a record, but it did not stop the policy on its own.
Frequently Asked Questions
Who can file a habeas petition?
Anyone held in government custody, citizen or not. Federal law also lets someone file on the detained person’s behalf, which is how lawyers and family members start a case when the person cannot.
Is habeas corpus the same as an appeal?
No. An appeal argues that a court made a legal error in a case. Habeas asks whether the government has any legal authority to detain a person at all.
Can the president suspend habeas corpus?
The Suspension Clause is in Article I, so it has long been treated as a congressional power. When Lincoln acted alone in 1861, Chief Justice Taney said he lacked the authority, and Congress later passed its own suspension law.
How many presidents have suspended habeas corpus?
Two. Lincoln suspended it during the Civil War, and Congress approved it later. Grant suspended it in 1871 in nine South Carolina counties under the Ku Klux Klan Act. Territorial governors suspended it in the Philippines in 1905 and in Hawaii after the 1941 attack on Pearl Harbor, for four suspensions in all.
Does habeas corpus apply to people who are not citizens?
Yes. The writ protects anyone held by the federal government inside the country, and the Supreme Court extended it to detainees at Guantánamo Bay in 2008.
What You Can Do
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If someone you know is detained, act the same day. Find them with the ICE detainee locator, call a lawyer from the Immigration Advocates Network directory, and ask about a habeas petition. The situation guide above covers the next steps.
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Support the lawyers filing petitions. The National Immigration Project, the ACLU and the Center for Constitutional Rights file habeas petitions and train volunteer lawyers.
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Ask your members of Congress where they stand on suspension. Ask them to say on the record that they would vote against suspending the writ for immigration enforcement, which is neither rebellion nor invasion.
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Tell Congress to repeal the Alien Enemies Act. The Neighbors Not Enemies Act (H.R. 630, S. 193) would repeal the 1798 law, and both versions have sat in committee since January 2025. Use the letter below to ask your members to co-sponsor it.