Agents from the US Department of Homeland Security arrested a Palestinian graduate student, Mahmoud Khalil, at Columbia University. Khalil had played a prominent role in last year's pro-Palestinian protests at the university. The arrest appears to be part of President Trump's efforts to fulfill his promise to seek the deportation of foreign students involved in the pro-Palestinian protest movement. The Trump administration recently canceled $400 million in grants and contracts to Columbia University over allegations of antisemitism.