"The fact of the matter is this guy stood up and he was, in fact, lying." "And I just pointed out, you're a liar," the former Delaware senator continued. "It's a fact. He lied, period. And so, you know, maybe I shouldn't have kidded with him about that." During the exchange, the man made debunked claims that the former vice president sent his son to work for an energy company in Ukraine. The Iowan also challenged Biden about his age, which prompted Biden to challenge the man to a series of tests, including a push-up contest. Biden told Martin that...