The Columbia graduate student was supposed to attend the graduation celebration. Instead, he is in immigration detention, caught up in Trump’s crackdown on foreign students.

Students boo Columbia's acting president as she mentions detained protester Mahmoud Khalil:: The international student was a leading pro-Palestinian voice at the university and was detained by ICE in March:: New York:: Claire Shipman,

The head of Columbia University alluded to the detention of Palestinian activist Mahmoud Khalil during a commencement speech Wednesday that drew loud boos and chants of “free Palestine” from graduating students.