Here's the latest on the South Carolina GOP primary:Former President Donald Trump and former U.N. Ambassador Nikki Haley are facing off in the South Carolina Republican presidential primary. Polls opened at 7 a.m. ET and will close at 7 p.m. ET.There are a total of 50 delegates up for grabs. The statewide winner will take all of the at-large delegates, while the winner of each congressional district will earn three delegates.The contest is open to all registered voters. But anyone who voted in the state's Feb. 3 Democratic presidential primary is not eligible to participate in the GOP primary. Trump is looking to continue his unbeaten 2024 primary streak, while Haley is hoping her home state can help fuel a comeback. Trump is running well ahead of Haley in the polls, but she has vowed to remain in the race and stepped up her rhetoric against the GOP front-runner.