Mahmoud Khalil, a recent Palestinian graduate student at Columbia University and green-card holder, was arrested by Immigration and Customs Enforcement officers over the weekend in what is likely one of the first high-profile detentions of a student who participated in the the Israel-Hamas war.
The arrest follows through on one of , which directed the government to use all of its tools to punish those who have engaged in "antisemitic harassment and violence." The the federal law that authorizes deporting a foreign national who "endorses or espouses terrorist activity."
The move is an escalation in Trump's effort to increase deportations from the U.S. and strip protections from those who violate the new administration's priorities.
Michael Thaddeus, a mathematics professor at Columbia University, said the move seeking to strip Khalil's green card and deport him violates the broader trust from foreign students who come to study in the U.S.
"They come because of their trust and belief that they could speak out freely while they're here and not be imprisoned or harassed because [of] their political speech or activism or advocacy," Thaddeus said.
Khalil was one of the Palestinian students who negotiated on behalf of the campus protesters who pressed Columbia to divest from Israel over its war with Hamas in Gaza.
Amy Greer, Khalil's attorney, told NPR that ICE officers arrested Khalil in the lobby of his university-owned apartment.
First, they told Khalil his student visa had been canceled. But he's not on a visa; he's a legal permanent resident. His wife went to get his green card from their apartment, but officers said his lawful permanent residency had been revoked.
"I demanded to see a warrant or have a warrant shown to me or Mr. Khalil before they removed him, and the agent hung up the phone on me," Greer said. "Mr. Khalil was under the impression that as a lawful permanent resident, that he had some modicum of protection that may not exist for people who do have student visas or who are undocumented."
His wife, a U.S. citizen, later discovered he had been transferred to a detention facility in Louisiana, Greer said.
Government has burden to prove deportation
Green cards, also known as lawful permanent residency, allow people to live, work and travel as a U.S. citizen would. They can be revoked by an immigration judge for various reasons, including fraud in the application process or for criminal activity.
"If I have a permanent resident in removal proceedings, most of the time it's because of a criminal activity," said Kelli Stump, president of the American Immigration Lawyers Association, adding that once placed in immigration proceedings only an immigration judge can revoke the green card.
"The government bears the burden of proving the reason that this person is deportable from the United States. And then just depending on what ground we're looking at, that's where the fight ensues."
DHS spokeswoman Tricia McLaughlin said Khalil had been arrested in support of Trump's executive order on antisemitism, and that Khalil had "led activities aligned to Hamas, a designated terrorist organization."
Separately, in a , Secretary of State Marco Rubio linked to a story about Khalil's arrest and wrote the administration would be revoking the visas or green cards of Hamas supporters so that they can be deported.
"We will vigorously be pursuing Mahmoud's rights in court, and will continue our efforts to right this terrible and inexcusable – and calculated – wrong committed against him," Greer said in a later statement.
Several groups planned rallies and gatherings around Manhattan on Monday in protest of Khalil's arrest. Thaddeus, the professor, said the campus community was surprised ICE's first target was someone with a green card, rather than someone without legal status, calling it "horrifying and a little bit unexpected."
"It means that the strategy of the immigration police has gone in an unexpected direction," he said.
Columbia University did not respond to an immediate request for comment.
Trump builds on first term efforts to strip status
During Trump's first term, he took steps towards for foreign nationals and revoking people's immigration status, including denaturalization, or cancelling someone's status as a naturalized U.S. citizen.
Towards the end of his last term, Trump's within the immigration office to focus on denaturalization. at the time that about 40% of the 228 denaturalization cases the DOJ had ever filed were brought during Trump's four years in office.
USCIS also launched a whether people may have lied during their immigration application proceedings in order to get citizenship.
But immigration law experts have said that the number of people who might lie on forms is very small compared to the millions of people who are naturalized or receive green cards each year.
Copyright 2025 NPR
