Joe BidenJoe BidenTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE says he's ready to go head-to-head — or deltoid-to-deltoid — against President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE in a pushup contest. 

The former vice president made the comment during a Tuesday interview on MSNBC's "Morning Joe" after co-host Mika BrzezinskiMika Emilie BrzezinskiBiden to CBS reporter: 'Why, why, why, why, why?' Brzezinski on Sanders-Warren: Someone isn't telling the truth Scarborough to GOP: 'What job is worth selling your political soul over?' MORE asked how he would respond if Trump made fun of his age or mental state on the debate stage.
 
"I'll say, 'Come on, Donald. Come on, man,' " Biden, 76, replied with a grin. "How many pushups do you want to do, pal?"
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"Come on, run with me, man," the Democratic front-runner said he'd say to his 73-year-old political opponent.
 
Trump has repeatedly referred to the ex-VP as "Sleepy Joe." When Biden entered the 2020 race in April, Trump tweeted that he hoped Biden had "the intelligence, long in doubt, to wage a successful primary campaign."
 
Trump's reelection campaign didn't immediately return ITK's request for comment about Biden's pushup remarks.
 
A potential pushup showdown wouldn't be the first time a political figure has put their upper body strength on display.