A prominent Palestinian activist and former Columbia University student was arrested by federal immigration authorities who claimed they were acting on a State Department order to revoke his green card. The arrest comes as President Donald Trump vows to deport foreign students and imprison 'agitators' involved in protests against Israel's war in Gaza. The administration has placed particular scrutiny on Columbia, announcing that it would be cutting $400 million in grants and contracts because of the school's failure to squelch antisemitism on campus.