Ron DeSantis, the Florida governor, has consistently emerged as a plausible challenger in any Republican primary and has irked the former president by repeatedly refusing to rule out a nomination if Trump declares his candidacy. Trump, speaking in Pennsylvania over the weekend, stood next to a large screen showing what he said was polling data on how he fared against potential opponents in his own party. “We’re winning big, big, big in the Republican party for the nomination,” he said. “Let’s see: Trump at 71, Ron de Santimonius at 10 percent.” The insult appeared to be