Senator Lindsey Graham, a Republican from South Carolina, is up against a formidable challenge as he seeks a fourth term in the Senate. This Tuesday’s primary pits him against fellow Republican Mark Lynch. The race could potentially move to a runoff depending on the outcome.

In the Democratic camp, Dr. Annie Andrews, a pediatrician, currently stands as the frontrunner. Polling locations are set to close at 7 p.m. Eastern Daylight Time.

To keep up with the latest results, follow the live updates from Decision Desk HQ.