 So in that moment, J.D. Vance, a 39-year-old senator from Ohio in less than two years standing in that job, has become Donald Trump's running mate. He's a former U.S. Marine, a businessman and an author who once described himself as a never-Trumper and privately wondered in a message to a friend whether Mr. Trump was America's Hitler. But he now strongly defends the former president. Well, I've been talking to Andrew Giuliani, who's a former special assistant to Donald Trump,