Mark Sanford will challenge President Trump for the 2020 Republican presidential nomination.

Sanford, a former two-term governor of South Carolina, announced on Fox News Sunday with Chris Wallace that he will join ex-Massachusetts Gov. Bill Weld and former Illinois Rep. Joe Walsh in launching a long-shot campaign for the White House. No sitting president has lost his party's nomination since former President Chester A. Arthur in 1884.

The 59-year-old, who served South Carolina's 1st Congressional District covering the coastal region around Charleston from 1995 to 2001 and then again 2013 to 2019, had been openly mulling the prospect of a primary challenge pegged on the need for the GOP to reclaim its image as the party of fiscal conservatism.

Sanford is perhaps best known for his extramarital affair after he disappeared for almost a week during his second stint in the Palmetto State's governor's mansion. His gubernatorial staff told the public he was "hiking the Appalachian Trail," but it was later revealed he had flown to South America to see his Argentine mistress.