A Jewish student center at Cornell University is under guard after several online threats were made against students, as the White House warns of a rise in antisemitic hate across the nation. On Sunday, campus police at the university’s location in Ithaca were sent to guard Cornell’s Center for Jewish Living after a series of antisemitic comments were posted to an online message board, the university’s newspaper first reported. The remarks were posted on a website called Greekrank, an online forum meant to discuss fraternities and sororities. In one post, an anonymous user threatened to kill Jewish students. Other posts...