Joe Raedle/Getty Images; Win McNamee/Getty Images

William "Bill" Weld is a Republican former governor of Massachusetts. And he is also one of three GOP members who think President Donald Trump is unfit to continue as President.

As such, Weld—along with former Illinois Republican Representative Joe Walsh and former South Carolina Governor Mark Sanford—is challenging Trump for the GOP presidential nomination in 2020. And he is pulling no punches.

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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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TOPSHOT - US President Donald Trump looks on as he visits the American Cemetery of Suresnes, outside Paris, on November 11, 2018 as part of Veterans Day and the commemorations marking the 100th anniversary of the 11 November 1918 armistice, ending World War I. (Photo by CHRISTIAN HARTMANN/AFP/Getty Images)

As the field of Democratic candidates seeking the 2020 Presidential nomination to run against President Donald Trump is growing more and more crowded.

But one question that has remained is whether or not a Republican would challenge incumbent Donald Trump for the Republican nomination.

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