Students marched from Washington Square Tuesday to protest the arrest of Mahmoud Khalil​, a pro-Palestinian activist at Columbia University. Some arrests were made at City Hall.

Trump criticized universities across the country over pro-Palestinian protests, which he said created an unsafe environment for Jewish students.

Police officers detain a demonstrator during a protest, following the arrest by US immigration agents of Palestinian student protester Mahmoud Khalil at Columbia University, in New York City, U.S., March 11,