A US judge has temporarily blocked the deportation of Palestinian Columbia student Mahmoud Khalil as part of President Donald Trump's crackdown on anti-Israel protesters. Khalil, who has been a prominent figure in Columbia's pro-Palestinian student protest movement, was arrested and had his student visa revoked. The arrest has been denounced by demonstrators, the state attorney general, and the American Civil Liberties Union as an attack on free speech. Trump has publicly denounced Khalil and stated that his arrest is the first of many to come.