Biden gets in testy exchange in Iowa: 'You're a damn liar'

Former Vice President Joe BidenJoe BidenBiden campaign slams Trump's Rose Garden event as 'sad affair' New shutdowns add to Trump woes CNN cuts away from Trump's 'campaign-type' Rose Garden speech 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.

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"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: "Of course you're not; you're too old to vote for me!" 

Biden campaign senior adviser Symone SandersSymone SandersSunday shows - Bolton's bombshell book reverberates Symone Sanders: 'Appalling' testing comment was 'most damning thing' from Trump rally Sunday shows preview: Bolton delivers bombshell while US tackles COVID-19, police brutality MORE later took to Twitter to defend the former vice president, saying the attendee's "facts were flat-out wrong" and "the crowd backed VP Biden up in his response."

Biden, who would become the oldest person ever elected president should he win his party's nomination and defeat President TrumpDonald John TrumpIvanka Trump pitches Goya Foods products on Twitter Sessions defends recusal: 'I leave elected office with my integrity intact' Former White House physician Ronny Jackson wins Texas runoff MORE, has repeatedly brushed off any questions about his health and physical fitness on the campaign trail.

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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 pressing Ukraine to fire a top prosecutor in 2015 while his son served on the board of Burisma, a Kyiv-based oil holdings company that had been investigated by Ukrainian officials.

Both Bidens have denied any wrongdoing, and claims that the vice president acted with his son’s interests in mind have been found to be baseless, though GOP lawmakers have pushed to investigate the efforts amid the House impeachment inquiry targeting Trump's own interactions with Ukraine.

In his now-infamous July 25 phone call with Ukrainian President Volodymyr Zelensky, Trump asked Zelensky to investigate the Bidens and the 2016 presidential election, telling the foreign leader to work with his personal lawyer Rudy GiulianiRudy GiulianiPress: Trump's final presidential pardon: himself Davis: Supreme Court decision is bad news for Trump, good news for Vance Sunday shows preview: Coronavirus poses questions about school safety; Trump commutes Roger Stone sentence MORE and Attorney General William BarrBill BarrACLU calls for special prosecutor to investigate removal of protesters in front of White House First federal prisoner in 17 years executed hours after Supreme Court decision Supreme Court clears way for federal executions MORE.

The call is at the heart of the impeachment inquiry in the House, with Democrats arguing that Trump abused his power by asking a foreign government to interfere in U.S. elections and investigate a key political rival. Trump has maintained that the call was "perfect."

—Updated at 5:39 p.m.