Former South Carolina Governor Mark Sanford announced his candidacy for the U.S. Senate on July 23, 2026. Sanford, a Republican and critic of former President Donald Trump, joins a competitive field that includes candidates endorsed by Trump. Sanford stated, "We’re at a tipping point, and that’s why I’ve decided to run for the U.S. Senate," emphasizing his record in Congress and as governor.
Senator Darline Graham, appointed to fill her late brother's term, also declared her intention to run for a full six-year term shortly after receiving Trump's endorsement. Other candidates include Republican Representatives Ralph Norman and Russell Fry, both of whom support Trump and are positioning themselves as his allies in the Senate.
The special Republican primary is scheduled for August 11, 2026, with a potential runoff on August 25 if no candidate receives more than 50% of the vote. Sanford, who has previously served in Congress and as governor, cited concerns about national debt as a key reason for his Senate bid.
Political analysts view Graham as a frontrunner due to her name recognition and Trump's backing, while Sanford's campaign appears to be more independent of Trump's influence. The outcome of the primary will significantly impact the general election against the Democratic nominee, Annie Andrews.