A former police chief in New Jersey who is on trial on a federal hate-crime charge after he allegedly slammed a black teenager’s head into a doorjamb, once called President Trump “the last hope for white people,” according to a recording recently played for jurors. In the 2016 recording, which federal officials shared with The New York Times, Frank Nucera Jr., the former chief, can be heard saying that Mr. Trump was the last hope because “Hillary will give it to all the minorities to get a vote. That’s the truth! I’m telling you.” The Trump comment was surreptitiously recorded...