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Oprah Winfrey delivered a scathing final warning about the dangers of a second term for Donald Trump at Kamala Harris' final rally of her presidential campaign.

The veteran talk show host joined the vice president at her star-studded rally in Philadelphia on Monday night, marking the last of her five campaign stops in the must-win swing state of Pennsylvania on the eve of Election Day.

Pop star Lady Gaga then sang a rendition of Irving Berlin's song God bless AmericaOprah took the stage and gave her final pitch to Americans to vote, warning that democracy could be at stake if Trump is re-elected.

“You have to choose. And listen, I know some of you are feeling burnt out and hurting and maybe inconsequential. Nothing could be further from the truth. Every single vote, every single one will matter,” the media mogul said.

“If we don’t show up tomorrow, it’s entirely possible that we won’t have the opportunity to vote again.”

Oprah warned that America was on the “precipice of danger” and claimed that those who do not want to vote for a presidential candidate risk ceding control to an authoritarian regime.

“And let me be very clear: If you don't ensure that the people in your life can vote, that's a mistake. The decision not to choose is certainly a decision to let other people control the future,” she continued.

“We are voting to save ourselves from this abyss of danger in which we now find ourselves.

“All the fear and anxiety you feel is because you feel the danger. And you can change that with your vote.”

Oprah's warning comes as Trump has ramped up his authoritarian rhetoric during his campaign and suggested that if he wins the 2024 race, he would ensure Americans never have to vote again.

In late July, after Harris rose to the top of the Democratic voter roll, Trump told a Christian audience in Florida that they should “go out and vote just this time,” adding that “you don't have to do it anymore.” if he wins on November 5th.

A chorus of Democrats branded the statement “appalling,” while Trump's surrogates dismissed the remark as a joke.

The Republican presidential candidate last month also called for the military to be used to crack down on “radical left-wing lunatics,” branded his political opponents “enemies from within” and called for their imprisonment.

Both Harris and Trump's longest-serving chief of staff, John Kelly, have condemned the former president as a fascist who could rule as a dictator, with the vice president last week rebuking Trump as a “would-be dictator” and a “petty tyrant.”

Equally concerned prophets of doom in Trump's camp have also claimed that a Harris victory would strip voters of their rights.

Trump megadonor and likely Cabinet member Elon Musk met with Joe Rogan on Monday as the podcaster finally announced his support for the former president.

“If Trump doesn’t win, this is the last election,” Musk said.

“I think you’re right,” Rogan agreed. “I think a lot of people are waking up and realizing – they've been Democrats all their lives… like I can't do that anymore.”

Musk added: “You and I used to be Democrats.”

“It’s crazy, it’s crazy,” Rogan added.

Musk made similar comments last month when he joined Trump on stage at a rally in Butler, Pennsylvania, claiming that “this will be the last election” if the Republican candidate doesn't win.