Open this photo in gallery: The Trump administration has said Harvard’s foreign students must now transfer or lose their legal status. The university has called the action unlawful and said it is working to provide guidance to students.Scott Eisen/Getty Images U.S. President Donald Trump’s administration has escalated its battle with Harvard University by revoking the school’s ability to enroll foreign students, casting doubt on the futures of thousands of scholars, including hundreds of Canadians. The Department of Homeland Security said in a Thursday press release that Harvard has created an unsafe campus and permitted “pro-terrorist agitators” to harass and assault...