President Donald Trump was unable to clear the field Tuesday for his choice to replace Sen. Lindsey Graham when the late South Carolina Republican’s younger sister, Darline Graham, failed to win a clear majority in the GOP primary election.Graham, a 62-year-old vocational rehabilitation administrator, will now face Rep. Ralph Norman, who retired from his northern South Carolina seat to run for governor, only to finish third in the GOP primary in June.Whoever wins that Aug. 25 runoff will face pediatrician Annie Andrews, who won the Democratic nomination in June, in the November general election.Sen. Darline Graham speaks ahead of the special GOP primary to replace her late brother, Sen. Lindsey Graham, on Aug. 1, 2026, in Lexington, South Carolina. AP Photo/Meg KinnardGraham’s elder brother won the GOP nomination in June as he sought his fifth term in the Senate, but died on July 11 of an aortic dissection — a tear in the main artery from his heart — brought on by heart disease.Unlike Lindsey Graham, whose political career began 34 years ago with a run for a South Carolina state legislative seat, Darline Graham’s career began exactly four weeks ago, two days after her brother’s death. While she was first discussed as a caretaker for the position until the new Congress starts in January, Trump quickly pushed for her to run for the full six-year term.It remains to be seen whether Trump will continue backing Graham heading into the runoff. Before the June primary, he endorsed the sitting lieutenant governor Pamela Evette in the governor’s race. But after she just barely defeated state attorney general Alan Wilson, Trump backed away from Evette and “co-endorsed” both candidates. Wilson wound up winning the runoff, with Trump claiming full credit.