In dueling campaign stops with the president in Minnesota, Joe Biden mocked Donald Trump for repeatedly saying he will reveal an infrastructure plan that never seems to materialize.
Mr Trump took particular exception to his opponent's continued reference of a Columbia University study showing implementation of coronavirus guidelines a week earlier would have saved 36,000 lives.
It was the second campaign event in as many days for Mr Biden after his CNN town hall appearance on Thursday night, in which he was mocked for breaking social distancing rules with host Anderson Cooper.
During the event, Mr Biden said he had benefited from white privilege and knew how it felt to be looked down upon because he was from working class Scranton and didn't go to an Ivy League university.
New polls showed Mr Biden well ahead of Mr Trump in Arizona and Maine. But in a call with Senate Democrats on Friday, the party's November contender said he takes nothing for granted and that he plans on appearing in key battleground states as the election enters the final bend.
Despite the continued advantage in the polling and only 46 days left before the public democratically elects the next occupant of the White House, Biden again called on the president to step down from his position in the Oval Office before his first term has expired.
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