March 28 (UPI) -- The State Department has revoked at least 300 visas, mostly over pro-Palestinian protests, Secretary of State Marco Rubio said, as the United States cracks down on the activism of foreign-born residents. "At some point, I hope we run out because we've gotten rid of all of them," he said Thursday during a press conference in Georgetown, Guyana. "But we're looking every day for these lunatics that are tearing things up." Advertisement He couldn't give an exact number saying it