Announcing that he was putting the nation on a “double-red threat level,” Donald J. Trump warned the American people on Tuesday to be on the lookout for terrorists posing as peaceful seventy-five-year-olds. “One of these terrorists was already identified by the police in Buffalo,” Trump said. “They may be coming to your town next.” Trump listed some “telltale signs of Antifa,” in order to help Americans identify septuagenarian terrorists in their midst.