Trump-Harris debate live updates: High-stakes showdown just hours away

The Trump campaign during a pre-debate call said Trump is in "good spirits" and will be departing shortly for Philadelphia.

"President Trump is in good spirits. He is currently in Mar-a-Lago. My understanding is that he will be departing shortly to head over to Philadelphia," said Trump campaign senior adviser Danielle Alvarez when asked about his mood going into the debate.

She suggested that the former president is "ready" to talk about inflation, housing affordability and the border among other issues on the debate stage. Alvarez also suggested that Trump might attack Harris for flip-flopping on some key issues such as fracking, police funding and electric vehicles.

"The president is certainly full of surprises. I know that we can expect him to be, you know, with his, his charming self. We know that he is incredible when it comes to weaving in and out of topics -- he's incredible on those policy issues. So that's ... certainly something that may happen," she said.

-ABC News' Soorin Kim, Lalee Ibssa and Kelsey Walsh

Tonight’s consequential presidential debate hosted by ABC News will consist of set rules to govern the matchup, restricting candidates’ speaking time, microphone access, and engagement with campaign staff.

There will be no audience present, and questions will come strictly from the moderators.

After winning the virtual coin flip, former President Trump will offer the final closing statement.

Read more here.

The Harris campaign will fly a drone show over the Philadelphia Art Museum from 8:05 to 8:25 p.m. ET at the famous Rocky Steps, just prior to the debate on Tuesday.

The show will add onto the campaign’s Philly-themed advertising and recent ad mocking Trump and crowd sizes, according to campaign spokesperson Kevin Munoz.

– ABC News’ Gabriella Abdul-Hakim, Fritz Farrow, and Will McDuffie

The verbal joust Tuesday night between Trump and Harris will touch on a range of issues, but none may be more important than the economy, which often ranks as the top priority among voters.

ABC News spoke to experts about what they will be watching for when the debate turns to the economy.

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Economic issues to watch out for on debate night

ABC News business reporter Alexis Christoforous on what many voters says is a top issue in the upcoming election.

They said they'll be looking for everything from the amount of substantive discussion, to the relevance of Biden’s legacy, to the prevalence of topics like inflation and taxes.

Read more here to learn what to watch for on the economy during the match-up, according to experts.

-ABC News’ Max Zahn