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Vice President Kamala Harris and former President Donald Trump square off Tuesday at what could be their only presidential debate, setting high stakes for an event expected to be viewed by millions of Americans and a key sliver of undecided voters.

Harris' momentum after her unusual rise as the Democrats' nominee shot her into a neck-and-neck race -- has now stalled, making the head-to-head matchup an opportunity to get that started again f she can adequately make the argument for her own candidacy and cast Trump as unfit for another term.

Trump, meanwhile, has struggled to find a way to consistently and effectively attack his new opponent but has remained highly competitive, thanks to a large base of immovable supporters and the broad swath of Americans who already have fixed views of him. Tuesday's debate offers him an opportunity to solidify his support while painting Harris in a negative light to an electorate that has less cemented perceptions of her.

The ABC News debate, moderated by David Muir and Linsey Davis, will take place on Tuesday, Sept. 10 at 9 p.m ET. A prime-time pre-debate special will air at 8 p.m. ET. It will air on ABC and stream on ABC News Live, Disney+ and Hulu. Viewers can also stream the debate on the ABC app on a smartphone or tablet, on ABC.com and connected devices.

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