Third Circuit rejects Mahmoud Khalil full court rehearing in immigration detention case

The United States Court of Appeals for the Third Circuit has rejected Mahmoud Khalil’s request for a full court rehearing in his immigration detention case, leaving in place a January 2026 appellate ruling that sharply limits his ability to challenge detention in federal district court while immigration proceedings continue.

The May 22, 2026 order means the former Columbia University graduate student and pro Palestine activist faces a renewed legal push toward the United States Supreme Court, where his lawyers are expected to seek review of a case that has become a major test of immigration detention, federal habeas jurisdiction, free speech claims, and executive authority in removal proceedings.

Mahmoud Khalil, a lawful permanent resident of the United States, was arrested by United States Department of Homeland Security officers in March 2025 after his role in pro Palestine activism at Columbia University drew the attention of the Trump administration. His lawyers have argued that his detention and deportation proceedings were tied to protected speech and political advocacy. The federal government has maintained that the immigration case belongs within the administrative immigration system and that federal district court review should not interrupt those proceedings.

The Third Circuit’s refusal to rehear the case leaves intact an earlier panel ruling that found the federal district court in New Jersey lacked authority to block aspects of the immigration detention and removal process at the stage when the case was still moving through immigration channels. That ruling affected earlier orders that had helped secure Mahmoud Khalil’s release from detention and restricted the government’s ability to detain or remove him on certain grounds.

The latest order was not unanimous. Five judges voted in favour of rehearing the matter before the full court, while a majority of the active judges did not vote to rehear the case. Judge Thomas M. Hardiman issued the order for the court. Judge Cheryl Ann Krause, joined by Judge L. Felipe Restrepo and Judge Arianna J. Freeman, filed a dissent from the denial of rehearing en banc.

Why did the Third Circuit reject Mahmoud Khalil’s full court rehearing request in the detention case?

The Third Circuit denied Mahmoud Khalil’s request for rehearing because a majority of the active judges did not vote to revisit the January 2026 panel decision. The order also stated that no judge who fully concurred in the court’s earlier decision had asked for panel rehearing.

The procedural outcome matters because a rehearing en banc would have allowed the full Third Circuit to reconsider whether the district court had jurisdiction over Mahmoud Khalil’s constitutional and detention related claims while immigration proceedings were still pending. Without rehearing, the January 2026 panel decision remains the controlling appellate ruling.

The January decision centered on how federal courts should treat habeas and constitutional challenges brought by a noncitizen who is simultaneously facing immigration removal proceedings. Mahmoud Khalil’s legal team argued that his claims were independent of the immigration court process because they involved alleged retaliation, detention conditions, and First Amendment issues. The government argued that the Immigration and Nationality Act channels such challenges into the immigration review process and restricts district court intervention before a final removal order or related appellate pathway.

The Third Circuit’s ruling therefore does not simply concern one detention order. It affects the timing and forum of judicial review. The decision strengthens the government’s position that immigration courts and immigration appeals should remain the primary route for resolving disputes tied to removal proceedings, even when the person facing removal raises constitutional objections.

For Mahmoud Khalil, the immediate legal consequence is that his lawyers must now seek relief from the United States Supreme Court if they want to halt the mandate and preserve federal court protection against renewed detention while the broader litigation continues.

How does the Mahmoud Khalil case connect immigration detention to free speech claims?

Mahmoud Khalil’s case has drawn national attention because it sits at the intersection of immigration enforcement and political speech. The case involves a lawful permanent resident who was active in pro Palestine advocacy at Columbia University during a period of intense political scrutiny over campus protests related to Gaza, Israel, antisemitism, civil liberties, and university discipline.

His lawyers have argued that the federal government targeted him because of his political views and public advocacy. They have also argued that his detention and removal case raise urgent constitutional concerns that should not be delayed until the end of immigration proceedings. The legal team’s position is that waiting until the immigration process concludes could leave critical claims unreviewed when the alleged harm is detention itself.

The government’s position is different. Federal officials have treated the matter as an immigration case involving removability grounds, including a foreign policy related provision and separate allegations tied to omissions in immigration paperwork. The government has argued that immigration law provides a structured system for handling such disputes and that district courts should not bypass that system.

This is why the case has become larger than a single deportation dispute. At stake is whether a noncitizen who alleges politically motivated detention can secure immediate federal district court review, or whether the person must first move through immigration court, the Board of Immigration Appeals, and the federal appellate review process connected to removal orders.

The Third Circuit’s latest order leaves unresolved the broader constitutional debate. It does, however, keep in place a procedural ruling that favours immigration process channeling over immediate district court intervention.

What did the dissenting Third Circuit judges signal about judicial review and executive power?

The dissent from the denial of rehearing reflected concern that the court was stepping back from judicial oversight in a case involving alleged constitutional injury, immigration detention, and executive branch authority.

The dissenting judges warned that federal courts risk diminishing their role if they decline to review urgent constitutional claims while the executive branch controls detention and removal timing. Their view was that Mahmoud Khalil’s claims were not merely routine objections to an immigration order but now or never claims tied to detention and alleged retaliation.

That divide is important because federal courts often treat immigration law differently from ordinary civil litigation. Congress has given immigration courts and immigration appellate channels substantial authority. At the same time, the Constitution protects access to habeas review and judicial oversight when the government detains individuals.

The split inside the Third Circuit shows the institutional tension clearly. One side placed weight on the statutory structure of the Immigration and Nationality Act and the limits it places on district court jurisdiction. The dissenting side placed weight on the judiciary’s responsibility to review constitutional claims before the alleged injury becomes irreversible.

For legal observers, this is the part of the case most likely to matter at the Supreme Court stage. The question will not only be whether Mahmoud Khalil can remain free while litigation continues. It will also be whether federal courts can immediately hear constitutional challenges to immigration detention when removal proceedings are active.

Why does the January 2026 Third Circuit ruling remain central after the rehearing denial?

The January 2026 Third Circuit ruling remains central because the May 2026 order did not replace or revise it. The rehearing denial leaves that earlier panel decision standing as the operative appellate judgment.

The January ruling affected orders issued by the United States District Court for the District of New Jersey, where Mahmoud Khalil had pursued habeas relief and related constitutional claims. The district court had previously entered orders that restricted the government’s ability to detain or remove Mahmoud Khalil based on the foreign policy charge and later ordered his release from detention.

The Third Circuit panel concluded that the district court lacked subject matter jurisdiction over key parts of the dispute because the claims were sufficiently connected to removal proceedings. That conclusion effectively pushed the dispute back toward the immigration court and immigration appeals system.

The panel’s reasoning also placed significant weight on the Immigration and Nationality Act’s jurisdiction stripping provisions. Those provisions are designed to consolidate review of removal related issues and limit fragmented litigation across district courts. Mahmoud Khalil’s lawyers dispute that those provisions should apply to claims they describe as independent constitutional challenges.

The rehearing denial means the Third Circuit will not revisit that reasoning unless the United States Supreme Court intervenes. It also means the government may argue that district court limits are now settled at the appellate level, while Mahmoud Khalil’s lawyers will argue that the case presents a nationally important constitutional question requiring Supreme Court review.

What happens next as Mahmoud Khalil’s legal team turns to the United States Supreme Court?

Mahmoud Khalil’s lawyers are expected to ask the United States Supreme Court to review the Third Circuit’s decision and to seek an immediate stay of the mandate. A stay would be designed to prevent the Third Circuit ruling from taking effect in a way that could expose Mahmoud Khalil to renewed detention while the Supreme Court petition is pending.

The timing is critical because the appellate mandate is the formal step that returns authority to the lower court and allows the appellate ruling to become operational. Without a stay, the legal protections flowing from earlier district court orders could weaken or lapse, depending on how the mandate is implemented and how other pending orders interact with the case.

The case also intersects with separate immigration proceedings. The Board of Immigration Appeals has already issued a final removal related decision in the broader matter, while Mahmoud Khalil’s legal team continues to contest both the deportation path and the underlying basis for removal. His lawyers have maintained that other court orders still restrict the government’s ability to detain or remove him immediately.

For the Supreme Court, the case could present several questions. One concerns whether district courts can hear constitutional claims challenging immigration detention before the immigration process ends. Another concerns whether statutory immigration review channels can delay review of alleged First Amendment retaliation claims. A third concerns how courts should handle claims that the executive branch used immigration powers to respond to political advocacy.

The Supreme Court does not have to take the case. But if the court does intervene, the outcome could shape how noncitizens, lawful permanent residents, immigration judges, federal district courts, and federal agencies handle politically sensitive immigration detention disputes in future cases.

Why does the Mahmoud Khalil detention case matter beyond Columbia University and immigration court?

The Mahmoud Khalil detention case matters beyond Columbia University because it brings together several national fault lines: campus protest, United States foreign policy debate, immigration enforcement, lawful permanent resident protections, federal court jurisdiction, and the role of habeas corpus in checking detention power.

The case has unfolded during a period in which universities, federal agencies, lawmakers, civil liberties groups, and advocacy organizations have been fighting over how to distinguish protected political expression from conduct that institutions or governments may regulate. Mahmoud Khalil’s role in pro Palestine activism made the detention case a symbol in that broader debate, even as the courts remain focused on statutory jurisdiction and removal procedure.

For immigration law, the case tests whether lawful permanent residents accused of removability can bring immediate constitutional claims in district court or must wait for the immigration process to run its course. For civil liberties groups, the case raises concern that political speech could become entangled with immigration enforcement. For the federal government, the case tests the boundaries of executive authority in removal proceedings involving foreign policy concerns.

The Third Circuit’s latest order does not resolve those national questions. It leaves the January ruling in place and moves the fight closer to the United States Supreme Court. That is why the rehearing denial is procedurally narrow but institutionally significant.

Mahmoud Khalil’s case now stands as a high profile example of how immigration procedure can become the forum for constitutional conflict. The next phase will determine whether the Supreme Court treats the dispute as a case about statutory channeling, emergency detention review, protected political speech, or all three at once.

What are the key takeaways from the Third Circuit ruling in Mahmoud Khalil’s detention case?

• The United States Court of Appeals for the Third Circuit rejected Mahmoud Khalil’s request for a full court rehearing on May 22, 2026. The order leaves in place a January 2026 ruling that limits his ability to challenge detention in federal district court while immigration proceedings continue.
• Mahmoud Khalil’s lawyers are expected to seek review from the United States Supreme Court. The legal team is also seeking a stay of the mandate to prevent the appellate ruling from taking effect in a way that could expose him to renewed detention.
• The case involves a lawful permanent resident and former Columbia University graduate student who was active in pro Palestine advocacy. His lawyers have argued that the detention and removal proceedings are connected to protected speech and political expression.
• The federal government has treated the matter as an immigration case governed by the Immigration and Nationality Act. The government has argued that challenges tied to removal proceedings should proceed through immigration court and immigration appellate channels.
• The Third Circuit order was not unanimous, with five judges voting in favour of rehearing en banc. Judge Cheryl Ann Krause, joined by Judge L. Felipe Restrepo and Judge Arianna J. Freeman, filed a dissent from the denial of rehearing.
• The dispute now carries legal significance beyond one detention case. The next phase could affect how federal courts handle constitutional claims, immigration detention challenges, and removal proceedings involving politically sensitive speech.