Article snippet: Former Vice President MORE on Thursday got in a tense back-and-forth with an audience member during an Iowa campaign stop after the man made debunked claims that the former vice president sent his son Hunter Biden to work for an energy company in Ukraine. "You're a damn liar, man. That's not true," Biden shot back at the man, who said the claims, which have been circulated by some on the right, were backed up by reporting on television. After some cross-talk, Biden told the man, "By the way ... I'm not sedentary," before going on to challenge him to a push-up contest and other physical tests. "You want to check my shape man, let's do pushups together here, man," Biden told him. "Let's run. Let's do whatever you want to do. Let's take an IQ test. OK?" When the man replied that he wouldn't be voting for Biden in the primary, the former Delaware senator replied: Biden campaign senior adviser Biden, who would become the oldest person ever elected president should he win his party's nomination and defeat questions about his health and physical fitness on the campaign trail. Should he win the general election in 2020, Biden would be 78 by Inauguration Day. Trump previously set the record for age at a presidential inauguration – he was 70 years old when he was sworn into office in 2017. The tense exchange at the event Thursday comes as Biden has pushed back against claims promoted by Trump and his allies that the former vice president acted inappropriately by pressin... Link to the full article to read more