Another open letter from Republicans endorsing Vice President Kamala Harris‘ presidential bid just dropped. This one, first reported by the New York Times, is signed by 111 former national security and foreign policy officials who worked under former presidents Ronald Reagan, George H.W. Bush, George W. Bush—and, yes, Trump himself. The blistering letter characterizes Trump as “unfit to serve,” alleging that he “cannot be trusted” to uphold the Constitution.