South Carolina congressman Jeff Duncan says he's endorsing Sen. Ted Cruz for president because the Texas senator has "a history of following through" on his word.
A tea party favorite like Cruz, Duncan is scheduled to appear alongside the Texas senator at a Tuesday evening rally in the state.
Duncan represents one of the most conservative districts in South Carolina. His fellow South Carolina congressman, Rep. Trey Gowdy, has lined up with Marco Rubio, who also added South Carolina Sen. Tim Scott earlier Tuesday.
Rubio, Cruz and Donald Trump are expected to continue their three-way tussle in South Carolina. Trump's most high-profile backer among South Carolina politicians is the lieutenant governor, Henry McMaster.
Gov. Nikki Haley has yet to endorse a candidate in the race.