Bauer, a wealthy developer, is a longtime backer of President Donald Trump. His candidacy sets up a midterm grudge match with Graham, a four-term senator whose relationship with Trump has undulated through the years, but who has Trump's endorsement for reelection.

Andre Bauer, the former lieutenant governor of South Carolina, launched his bid on Wednesday to replace Sen. Lindsey Graham (R-SC). Bauer had hinted at the move in an exclusive interview with the Washington Examiner last week.

The Palmetto State’s senior senator has faced primary challenges before, and multiple challengers helped lead to a split in the anti-Graham vote.