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The majority of debate watchers think Harris won the debate.

According to a poll taken by CNN and SSRS after the debate, 63% of debate watchers said Harris and 37% said Trump.

The poll has a margin of error of +/- 5.3% points.

CNN said that before the debate, respondents were completely split.

The CNN instant poll in June found that among debate watchers, 33% thought Biden won and 67% thought Trump won.

Donald Trump said he had “no idea” when asked by CNN what his reaction was to Taylor Swift’s endorsement of Kamala Harris.

Asked by CNN about how he thought he performed tonight, Donald Trump said it was his “best debate”.

Speaking to Fox News, Trump compared Kamala Harris to a boxer who had just lost in the ring.

“When you’re a prize fighter and you lose, you immediately want a new fight,” he said.

“This is the most important celebrity endorsement that I ever seen. The timing on it is absolutely exquisite, the wording of it is flawless. For someone who’s never been impressed by a celebrity endorsement, this is perfect and powerful," MSNBC anchor Lawrence O'Donnell said.

Donald Trump's allies have attacked "biased" ABC News after admitting that Kamala Harris performed well against him in Thursday's presidential debate.

The former president's surrogates told reporters in the spin room at the debate in Philadelphia that "biased" moderation by ABC's David Muir was the cause of their candidate's uneasy performance.

Mr Muir interrupted Trump several times to offer rebuttal of his points, including that Haitian migrants are eating dogs and cats in Springfield, Ohio.

Vivek Ramaswamy, the former Republican primary contender, said: "[There was] a much more biased setting this time around, that I think people at home will see through.

"So I do hope that there is not only another debate, but another debate...where the candidates can actually talk directly at each other, rather than have something that is laundered through what I do think was a biased moderation."

"Particularly Jonathan [sic] Muir I think was imbalanced in the way he handled that debate moderation."

- Tony Diver, Daily Telegraph UK

Republican Senator Lindsey Graham of South Carolina told MSNBC that Donald Trump's debate performance was a "disaster" in the spin room, saying that his debate team should be fired.