Trump's Backing Faces Key Test in South Carolina Senate Runoff

South Carolina Republicans head to the polls Tuesday to choose a nominee for the late Sen. Lindsey Graham's seat, with President Trump endorsing Graham's sister, Darline Graham, against Rep. Ralph Norman. The runoff will gauge Trump's political influence after several of his primary picks lost this cycle, and it also highlights a divide over foreign policy experience. Darline Graham has acknowledged limited national security knowledge, while Norman emphasizes his House record on international affairs.