Using a tactical vehicle, New York City police enter an upper floor of Hamilton Hall on the Columbia University campus in New York, Tuesday, April 30, 2024, after the building was taken over by protesters earlier in the day. (AP Photo/Craig Ruttle, File) NEW YORK (AP) — The Trump administration has delivered an extraordinary ultimatum to Columbia University, threatening to permanently end federal funding to the Ivy League school unless it cedes control of an international studies department and implements sweeping changes to other campus policies. In a letter sent Thursday night, federal officials said the university must immediately place...