President Donald Trump has signed a proclamation to suspend international visas for new students at Harvard University, the White House announced Wednesday, in a dramatic escalation of its efforts to block foreign nationals from enrolling at the elite university.

Harvard University on Thursday filed a legal challenge to President Donald Trump’s efforts to block visas for foreign students planning to attend the Ivy League college.“Singling out our institution for its enrollment of international students and its collaboration with other educational institutions around the world is yet another illegal step taken by the Administration to retaliate against Harvard,

Lately, Wesleyan University’s Michael Roth has started making a habit of checking in with his dean of admissions more often. He’s worried about their international students — and whether any have opted not to enroll.