President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE has been saying that he could easily defeat Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) if he challenged him in 2020, Politico reported Monday.

Trump has been speculating with aides and other Republicans about which Democrat will run against him for the presidency, but has dismissed Sanders as a viable candidate.

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The president has said that Sanders, 76, won’t have the energy for a second presidential bid, but that he could easily beat the Vermont independent if he decides to run again. Trump will be 74 at the time of the election.

Allies say Trump should be more concerned about a bid from Oprah Winfrey or former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE, 75.

“What we can’t let voters do is think they can get the same policies with someone they like better, like Joe Biden — someone who would fight for them but who doesn’t have the crass edge,” one former White House staffer told Politico. “I hope CNN has [New York Sen.] Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE [D] on every minute of every day. Love it. Bring it. She's easy to destroy. If you're the president, or the [Republican National Committee], you're more worried about someone who looks like Biden — someone who has more mainstream appeal, who blue-collar workers could identity with.”

Trump has reportedly said that Sanders would run against him “even if he’s in a wheelchair.”

Sanders ran as a Democrat in 2016 but lost the party’s nomination to Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.

However, after Clinton’s surprise loss to Trump, some Democrats wondered whether Sanders could have defeated Trump instead.

Trump’s campaign pollster is among those that said Sanders would have beat Trump in a general election.

Sanders is discussing whether or not to run again in 2020.

Winfrey, 63, has been the subject of presidential speculation following a passionate speech she gave at the Golden Globes on the subject of sexual misconduct.

“Oprah would be a problem: she’d be their best,” one GOP strategist said. "She’s ubiquitous, she’s black, she has crossover appeal and she probably clears a lot of the field out.”