Police have arrested dozens of demonstrators from a Jewish group who filled the lobby of Trump Tower to denounce the immigration arrest of Mahmoud Khalil, a pro-Palestinian activist who helped lead protests against Israel at Columbia University.

Dozens of people marched from Times Square to Columbus Circle on Saturday, calling for the release of Palestinian activist Mahmoud Khalil, a Columbia University graduate student and green card holder.

The university sanctions demonstrators involved in pro-Palestinian protests last spring while the arrest of organizer Mahmoud Khalil has become a flashpoint on the rights of legal U.S. residents and free speech.