The US Justice Department is investigating whether Columbia University concealed 'illegal aliens' on its campus, as part of the Trump administration's campaign to deport foreigners who participated in anti-Israel and pro-Palestinian demonstrations at the school. Agents with the Department of Homeland Security searched two university residences with a warrant, but no one was arrested. The investigation is ongoing, and the authorities are also looking into whether Columbia's handling of earlier incidents violated civil rights laws and included terrorism crimes.