Hundreds of protesters flooded the lobby of Trump Tower Thursday to denounce the arrest of Mahmoud Khalil, a Palestinian activist detained by ICE over his involvement with pro-Palestinan demonstrations at Columbia University.

Khalil's arrest is the first known deportation effort under Trump’s promised crackdown on students who protested the war in Gaza.

A federal judge said Khalil will remain in the U.S. as the court weighs a challenge to his planned deportation, as President Donald Trump says his arrest will be the first of many.