The White House complained that Columbia University is refusing to help federal agents find people being sought as part of the government’s effort to deport participants in pro-Palestinian demonstrations.

Dozens of University of Chicago students and faculty members rallied on Tuesday in support of a former Columbia University student and pro-Palestinian activist Mahmoud Khalil, who was arrested by federal immigration authorities over the weekend in New York.

Mahmoud Khalil, a 29-year-old legal resident of the United States, was arrested and detained by federal agents Sunday, after his green card was revoked by the Trump administration.