Trump labels GOP challengers the 'Three Stooges'

President TrumpDonald John TrumpAlaska Republican Party cancels 2020 primary Ukrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' MORE early Monday knocked former Rep. Mark SanfordMarshall (Mark) Clement SanfordAlaska Republican Party cancels 2020 primary Trump challenger Bill Weld: 'My goal is to win' The Hill's Morning Report - Pompeo condemns Iran for 'act of war' while Trump moves with caution 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) WeldAlaska Republican Party cancels 2020 primary Overnight Energy: California, 23 other states sue Trump over vehicle emissions rule | Climate strike protests hit cities across globe | Interior watchdog expands scope of FOIA investigation | Dems accuse officials of burying climate reports Bill Weld: 'I wouldn't take money from the oil and gas companies' MORE and former Illinois Rep. Joe WalshJoe WalshAlaska Republican Party cancels 2020 primary Trump challenger Bill Weld: 'My goal is to win' The Hill Interview: Sanford says Trump GOP doing 'serious brand destruction' MORE in challenging Trump for the Republican nomination.

Pressed by "Fox News Sunday" host Chris WallaceChristopher (Chris) WallaceAmash says Sanford presidential bid won't impact decision on whether he runs in 2020 Trump labels GOP challengers the 'Three Stooges' Pompeo: Taliban talks are dead 'for the time being' 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.