Open this photo in gallery: Students, faculty and members of the Harvard University community rally, on April 17, in Cambridge, Mass.Charles Krupa/The Canadian Press President Donald Trump’s administration has escalated its ongoing battle with Harvard, threatening to revoke the university’s ability to host international students as the president called for withdrawing Harvard’s tax-exempt status. The moves raise the stakes of the showdown between the White House and the nation’s oldest, wealthiest and arguably most prestigious university, which on Monday became the first to openly defy the administration’s demands related to activism on campus, antisemitism and diversity. The Department of Homeland...