The vice president is cloistered in a historic hotel in downtown Pittsburgh where she can focus on honing crisp two-minute answers, per the debate's rules. She's been working with aides since Thursday and chose a venue that allows the Democratic nominee the option of mingling with swing-state voters.

Trump, the Republican nominee, publicly dismisses the value of studying for the debate. The former president is choosing instead to fill his days with campaign-related events on the premise that he'll know what he needs to do once he steps on the debate stage at the National Constitution Center in Philadelphia.

"You can go in with all the strategy you want but you have to sort of feel it out as the debate's taking place," he said during a town hall with Fox News host Sean Hannity.

Trump then quoted former boxing great Mike Tyson, who said, "Everybody has a plan until they get punched in the face."

Harris has said she is prepared for Trump to rattle off insults and misrepresent facts, even as her campaign has seen value in focusing on the middle class and the prospects of a better future for the country.

"We should be prepared for the fact that he is not burdened by telling the truth," Harris said in a radio interview for the Rickey Smiley Morning Show. "He tends to fight for himself, not for the American people, and I think that's going to come out during the course of the debate."

In her own preparation, Harris has the Democratic consultant Philippe Reines, a longtime aide to Hillary Clinton, portraying Trump. She likes to describe Trump as having a "playbook" of falsehoods to go after Democrats such as Clinton and former President Barack Obama.

Harris has said she understands Trump on a deeper psychological level. She has tried in speeches like her remarks at the Democratic National Convention to show that she would be a stronger leader than him -- an argument that gets at Trump's own desire to project and show strength.

Trump's June 27 debate against President Joe Biden shook up the election, with Biden's disastrous performance ultimately leading to him stepping aside as the Democratic nominee and endorsing Harris. Both campaigns know the first in-person meeting between Harris and Trump could be a decisive event in a tight race.

Trump is preemptively criticizing the ABC News debate moderators, claiming he will not be treated fairly. But he said he plans to let Harris speak, just as he did during his debate with Biden.

"I let him talk. I'm gonna let her talk," he said during the Hannity town hall.

Trump aides said that this time would be no different than the previous debate and that the former president would not be doing any more traditional prep. There are no stand-ins, no sets, no play-acting.

Instead, they point to Trump's frequent interviews, including taking questions at lengthy press conferences, sitting for hourlong podcasts, and participating in town halls with friendly hosts like Hannity.

Trump also meets regularly with policy advisers who are experts on issues that may come up during the debate. During these informal sessions, they talk about the issues, Trump's policies while he was in office, and the plans he's put forth for a second term.

"I have meetings on it. We talk about it. But there's not a lot you can do. You either know your subject or not. You either have good policy or not," he said in a New Hampshire radio interview.

Before the last debate Trump held sessions with notable Republicans like Florida Sen. Marco Rubio, who at the time was under consideration to be Trump's vice presidential pick. This time he has held sessions with Tulsi Gabbard, the former Democratic congresswoman and Democratic presidential candidate who is now backing Trump.

Gabbard, who is also now a member of Trump's transition team, was brought in specifically to help Trump this time around because she knows Harris, having debated her when the two were running for the Democratic nomination in 2020. She also hosted a recent town hall with Trump in Wisconsin.

Trump, aides insist, intends to put Harris on the defensive. He wants to portray her as too liberal as he tries to tie her to Biden's economic record and points out her reversals on issues such as a fracking ban that she no longer supports.

"We look forward for the opportunity for Americans to see her on stage, incapable of defending her policies and flip-flops," said Trump campaign spokeswoman Karoline Leavitt. "The president's proven he has a command of the issues, she does not."

Harris' team is banking that Trump will come off as extreme and that they can use the debate as a springboard to further build on the momentum that her short campaign has generated. The campaign plans to use the pre-debate weekend to hold 2,000 events with volunteers and reach more than one million voters.

"With hundreds of offices and thousands of staff across the battlegrounds, we are able to harness all the buzz around the debate and break through to hard-to-reach voters," said Dan Kanninen, the campaign's battleground states director, in a statement.

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Colvin reported from New York. Associated Press writer Michelle L. Price in Harrisburg, Pennsylvania, contributed to this report.