Topics: The Supreme Court, the coronavirus, the economy, race and policing, election integrity and the candidates' records. "You say the lie long enough, keep repeating, repeating, repeating, it becomes common knowledge".
Biden is now leading Trump in more than a handful of polls taken in Pennsylvania, with the former vice president ahead of Trump by more than eight points in three of them.
Mocking the 74-year-old Trump for one of his more notorious statements from the White House podium, Biden said: "Maybe you could inject bleach in your arm and that would take care of it".
Trump has been trailing Biden in the polls for the entire year, a reality that gives the president an urgent incentive to change the direction of the contest on national television if he can.
Trump often exaggerates claims about the news of the day, but Kall said Biden "needs to pick his battles regarding President Trump's falsehoods, since they aren't all created equal, and there will likely be many of them". "There's nothing smart about you, Joe", Trump said. "I put a mask on when I think I need it", Trump said.
When asked whether the campaign was concerned about a debate night gaffe from the former vice president, the source defended Biden, saying that "the American people know this about him". "But I tell you Joe, you could never have done the job we've done". The Biden campaign started airing an ad showing that a typical elementary school teacher, a firefighter, a construction manager and a registered nurse all pay thousands of dollars in taxes a year while Trump paid $750.
Those with knowledge of Biden's preparations suggest he will not take the fight to Trump if he can avoid it.
And his campaign communications director Tim Murtaugh amplified a new slur spread on social media that Biden was suspected of planning to cheat by wearing an earpiece.
Hours before the Cleveland showdown, Biden published his own tax returns - and at the debate demanded that Trump do likewise.
Underneath was a photo of standard headphones and a tub of ice cream.
If Barrett is quickly confirmed, as the Republican-led Senate expects, Trump will have tilted the highest court firmly to the right for years to come.
TRUMP: "I am looking very forward to the debate".
Democrats supporting Biden say instead, the discussion should be about systemic racism in the USA and the country's national reckoning over race relations brought to the fore by the May death of a Black man, George Floyd, while in police custody in Minneapolis, Minnesota, and the deaths of other Black people at the hands of police.