Trump labels GOP challengers the 'Three Stooges'

President TrumpDonald John TrumpTrump says he doesn't want NYT in the White House Veterans group backs lawsuits to halt Trump's use of military funding for border wall Schiff punches back after GOP censure resolution fails MORE early Monday knocked former Rep. Mark SanfordMarshall (Mark) Clement SanfordTrump declines to participate in Weather Channel 2020 climate change special Weather Channel to talk climate change with 2020 candidates Trump accuses media, Democrats of going 'crazy' over G-7 at his Miami resort MORE's (R-S.C.) entry into the Republican presidential primary, labeling the former South Carolina governor and his two other GOP challengers the "Three Stooges."

"When the former Governor of the Great State of South Carolina, @MarkSanford, was reported missing, only to then say he was away hiking on the Appalachian Trail, then was found in Argentina with his Flaming Dancer friend, it sounded like his political career was over," he tweeted.

"It was, but then he ran for Congress and won, only to lose his re-elect after I Tweeted my endorsement, on Election Day, for his opponent. But now take heart, he is back, and running for President of the United States. The Three Stooges, all badly failed candidates, will give it a go!" he added.

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Sanford announced his candidacy on Sunday, joining former Massachusetts Gov. Bill WeldWilliam (Bill) WeldTrump declines to participate in Weather Channel 2020 climate change special Weather Channel to talk climate change with 2020 candidates Trump accuses media, Democrats of going 'crazy' over G-7 at his Miami resort MORE and former Illinois Rep. Joe WalshJoe WalshTrump declines to participate in Weather Channel 2020 climate change special Weather Channel to talk climate change with 2020 candidates GOP presidential challengers condemn decision to host G-7 at Trump resort MORE in challenging Trump for the Republican nomination.

Pressed by "Fox News Sunday" host Chris WallaceChristopher (Chris) WallaceMulvaney faces uncertain future after public gaffes Poll: 14 percent of GOP voters say Trump should be impeached The Hill's 12:30 Report — Presented by Nareit — Buttigieg closes in on Biden, Warren in Iowa MORE on whether he believed he had a real chance in 2020, Sanford said, "You never know."

"Let’s go out and force or try and create a conversation on that which is not being talked about in this presidential cycle," he added.

Wallace also questioned Sanford about the extramarital affair that caused a scandal while he was governor.

“I learned a level of humility, a level of empathy that I didn’t have before,” Sanford said. “It is something of great regret. It’s something I’ve apologized extensively for.”

“In contrast to the president, where he says there’s not a single thing that he sort of regrets or apologizes for, I profoundly apologize for that,” he added.

Trump has also been accused of having affairs, notably with adult-film star Stormy Daniels.

Sanford, Weld and Walsh will face a president who has continued to receive support from most Republicans. A recent Morning Consult poll found that 85 percent of them approved of Trump.

The Republican parties in Kansas and Sanford’s home state of South Carolina on Saturday also voted Saturday to cancel their GOP primaries in 2020 ahead of the presidential race in moves that were criticized by the president's challengers.

Updated at 7:13 a.m.