Mahmoud Khalil a leader of protests, encampments at Columbia’s campus for months.

An anti-Israel activist, who students claim was a leader of protests and encampments on the Columbia University campus in New York City for months, has been arrested by U.S. Immigration and Customs Enforcement (ICE) agents, according to Fox News sources.

On Saturday, Mahmoud Khalil was taken into custody at his university-owned apartment on the city’s Upper West Side.

Secretary of State Marco Rubio reacted to the arrest and issued a dire warning to anyone supporting the Hamas terror group.

“We will be revoking the visas and/or green cards of Hamas supporters in America so they can be deported,” Rubio wrote in a post on X.

ICE agents told Khalil that they were acting on a State Department order to revoke his green card and student visa, according to Khalil’s attorney, Amy E. Greer of Dratel & Lewis. She released a statement alleging that ICE agents wrongfully arrested Khalil.

“Last night ICE agents wrongfully arrested Mahmoud Khalil, claiming his student visa was revoked – even though Mahmoud is legal permanent resident (green card) and not in the U.S. on a student visa,” Greer said. “Confronted with that fact, the ICE agents detained him anyway.”