Complaining about the presidential debate, the former president said he was fact-checked several times and the "audience...went crazy."

Political analysts caution polls do not predict who is going to win an election, but are a gauge of how people feel about the choice they have to make.

Now the debate Tuesday night — hosted by ABC News at Philadelphia's National Constitution Center — has become the first showdown between Harris and Trump, who both agreed to move forward with it after weeks of back-and-forth about the event's specifics. The debate begins at 9 p.m. Eastern Time on Tuesday, Sept. 10.