Mahmoud Khalil's attorney says he was detained by immigration officers who claimed his student visa was revoked, despite him not being on one. His whereabouts remain unknown.

A Palestinian protest leader at Columbia University was arrested by Department of Homeland Security agents Saturday night despite having a green card, his attorney said. President Donald Trump has promised to deport international students who participated in “pro-jihadist protests” on college campuses.

NEW YORK — Federal immigration authorities arrested a Palestinian graduate student who played a prominent role in last spring’s anti-Israel protests at Columbia University, according to his attorney.

Federal agents arrested Mahmoud Khalil, a Palestinian student who played a major role in last year's protests at Columbia University, students said.

ICE agents arrested Palestinian activist Mahmoud Khalil -- a leader in Columbia University's encampment movement -- on Saturday night, said attorney Amy Greer.