The gauntlet has been thrown down to President Trump by Democratic Presidential candidate Joe Biden.
Biden says if Trump makes an issue of his energy or age during a debate, he would challenge the President to a push-up contest.
Biden is 76, President Trump not much younger at 73. President Trump has mocked Biden, calling him 'Sleepy Joe, claiming Biden has lost a step since he was Barack Obama's running mate.
Biden has also mocked Trump in the past claiming he could beat him in a physical fight.
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