Columbia University protest leader Mahmoud Khalil will remain detained at an Immigration and Customs Enforcement facility in Louisiana, multiple outlets reported. The big picture: U.S. District Judge Jesse M.

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legal resident of the United States, was arrested and detained by federal agents Sunday, after his green card was revoked by the Trump administration.

Between classes, when throngs of students stream into and out of Columbia University ’s campus, the security lines can back up like a TSA checkpoint. There’s a switch-back path of metal fencing that leads into a white tent, where two sets of guards check and then swipe campus ID cards before letting students in and out.