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.

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.

Acting Columbia University President Claire Shipman on Wednesday bizarrely chose to stoke the flames by acknowledging arrested ex-grad student Mahmoud Khalil at the Ivy League school’s chaotic