Palestinian activist and former Columbia University graduate student Mahmoud Khalil asked the U.S. Supreme Court on October 19, 2026, to review a federal appeals court ruling that could expose him to renewed immigration detention while his deportation case continues.
The petition challenges a decision by the U.S. Court of Appeals for the Third Circuit that restricted the ability of a federal district court to consider Khalil's constitutional challenges to his detention before immigration proceedings are completed.
Khalil, a lawful U.S. permanent resident, remains free following his release from federal immigration custody in June 2025. The Third Circuit has stayed its ruling while he seeks Supreme Court review. The justices have not agreed to hear the case, and his separate deportation proceedings remain unresolved.
Why Khalil Is Asking the Supreme Court to Intervene
At the center of the dispute is whether federal district courts can promptly review claims that immigration detention violates constitutional rights, even while separate proceedings to determine whether someone can be removed from the United States remain underway.
Khalil's attorneys argue that delaying judicial review can leave people detained for months or longer before a court can effectively address allegations that the government is punishing constitutionally protected speech.
The legal challenge relies on habeas corpus, a longstanding procedure allowing individuals to ask a court to examine whether their detention is lawful.
On January 15, 2026, a three-judge panel of the Third Circuit ruled that federal immigration law barred the district court from granting relief through Khalil's habeas proceedings. The appeals court concluded that the relevant claims belonged within the statutory process for reviewing immigration decisions.
That distinction matters because the ruling addressed the district court's authority to consider Khalil's claims through this legal route. It did not conclusively determine whether the government's treatment of him violated the First Amendment.
The Third Circuit subsequently rejected a request for rehearing by the full court on May 22, 2026. Five judges supported rehearing, but the request did not receive the majority required to proceed.
According to the Center for Constitutional Rights, which represents Khalil, the Supreme Court petition seeks to preserve access to judicial review when immigration detention is challenged as unconstitutional.
How the Detention and Deportation Disputes Developed
Federal immigration authorities arrested Khalil on March 9, 2025, following his involvement in pro-Palestinian demonstrations at Columbia University in New York.
His detention became the subject of national attention, including earlier reporting on the immigration authorities' arrest of the Columbia activist.
The Trump administration has defended its effort to remove Khalil under a provision of the Immigration and Nationality Act concerning foreign-policy consequences.
Secretary of State Marco Rubio determined that Khalil's presence in the United States could have adverse foreign-policy consequences. Administration officials have accused Khalil of involvement in activities they characterize as antisemitic and disruptive.
Khalil and his attorneys reject the government's characterization. They argue that immigration authorities targeted him because of his political advocacy concerning Palestinians and Israel's war in Gaza, in violation of constitutional protections for freedom of expression.
In June 2025, U.S. District Judge Michael Farbiarz found that Khalil had demonstrated a likelihood of success on constitutional claims and ordered his release on June 20, after more than three months in immigration detention.
The administration appealed, leading to the Third Circuit ruling that Khalil is now asking the Supreme Court to review.
As Al Jazeera reported on October 19, the appellate decision could clear the way for Khalil's renewed detention and possible deportation if the existing legal protections no longer prevent those actions.
However, the detention challenge and the underlying deportation case follow separate legal paths.
In the deportation proceedings, immigration authorities seek to establish that Khalil is removable under federal immigration law. His attorneys are separately challenging that determination through the immigration appeals process, including litigation before the Fifth Circuit.
The Supreme Court petition concerning the Third Circuit's jurisdictional ruling does not, by itself, resolve whether Khalil can ultimately be deported.
What the Case Could Mean for Immigration Detention Challenges
The dispute extends beyond Khalil's individual circumstances because it concerns the timing and availability of federal judicial review when people in immigration custody allege constitutional violations.
Under the Third Circuit's approach, certain challenges must proceed through the immigration-review system rather than through immediate intervention by a federal district court.
Khalil's legal team maintains that this restriction can undermine constitutional protections when the detention itself is alleged to discourage or punish protected political expression.
The government, by contrast, has defended the immigration enforcement actions and the statutory framework governing how removal-related claims reach federal courts.
The question is therefore not simply whether immigration authorities possess detention and removal powers. It is also whether the legal process provides a sufficiently timely opportunity to challenge an allegedly unconstitutional use of those powers.
There is an additional reason the Supreme Court may examine the issue: federal appeals courts have taken different approaches to related questions about immigration detention and judicial jurisdiction.
In reporting on Khalil's petition, the Associated Press identified a relevant disagreement involving litigation brought by Georgetown University scholar Badar Khan Suri, another noncitizen who challenged immigration detention connected to allegations about political expression.
Differences between appellate court decisions can make a legal question more significant for Supreme Court review, although such disagreements do not guarantee that the justices will accept a particular petition.
If the Supreme Court agrees to hear Khalil's case, its eventual decision could clarify the relationship between immigration-review restrictions and federal courts' authority to consider constitutional detention claims.
The precise consequences would depend on the questions accepted for review and the reasoning of any eventual ruling. A decision concerning judicial jurisdiction would not necessarily settle Khalil's underlying First Amendment allegations or determine the outcome of his removal proceedings.
What Happens Next
Khalil's October 19 filing begins the Supreme Court petition process rather than a full hearing on the merits.
The federal government may respond to the petition, and the justices will decide whether the legal questions warrant review. If they grant the petition, the case would proceed through further briefing and potentially oral arguments before a decision.
If the Court declines review, the Third Circuit's decision would remain the controlling appellate ruling in this litigation, subject to the consequences of the existing stay and any further applicable proceedings.
The Center for Constitutional Rights' litigation record confirms that the Third Circuit stayed its mandate pending Khalil's pursuit of Supreme Court review. That procedural protection is distinct from a final ruling on whether the government may remove him.
For now, Khalil remains out of immigration detention, while his separate challenge to the removal determination continues.
The immediate question is whether the Supreme Court will take up the dispute over access to federal judicial review. Its answer could determine how Khalil's detention challenge proceeds and potentially influence how similar constitutional claims are handled in future immigration cases.
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