Talks have broken down between Columbia University students and administrators to clear the campus pro-Gaza encampment, the school’s president announced Monday. Monday is the last day of classes for the semester. Organizers and school officials had been in negotiations to remove the tents from the main campus lawns, which will be needed for graduation ceremonies in a couple of weeks. But the parties at the end of last week reached an impasse over divestment from companies and institutions that profit from Israel. “Regretfully, we were not able to come to an agreement,” University president Minouche Shafik wrote in an email...