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President Donald Trump speaks at the Galt House on August 21, 2019 in Louisville, Kentucky. (Photo by Scott Olson/Getty Images)

Historically, an incumbent president running for re-election is all but guaranteed their party's nomination. But like some other more controversial presidents, Donald Trump is facing a primary challenge -- in fact two: former Massachusetts Governor Bill Weld and former Illinois Congressman Joe Walsh—for the GOP nomination in 2020.

Or is he?

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