Columbia University says it has expelled or suspended some students who took over a campus building during pro-Palestinian protests last spring, and had temporarily revoked the diplomas of some students who have since graduated.

Columbia University announced Thursday it's discipling students involved in the occupation of a campus building during protests against the Israel-Hamas war last spring. The big picture: The move comes after the Trump administration last week pulled some $400 million in federal grants and contracts from the university over allegations of antisemitism and after federal agents arrested a Columbia protest leader.

The university said its judicial board had issued its sanctions against dozens of students who occupied Hamilton Hall.

Scores of people poured into the lobby of Trump Tower in New York City on Thursday to protest the arrest and detention of Columbia University student Mahmoud Khalil, whom the Trump administration aims to deport over his pro-Palestinian activism.

The arrest of pro-Palestinian organizer Mahmoud Khalil has become a flashpoint on the rights of legal U.S. residents and free speech.

The arrest and threatened deportation of a student activist at Columbia University is a threat to free speech on campus and across the U.S., says professor Michael Thaddeus.