Republican Gov. Nikki Haley of South Carolina will announce GOP Sen. Jim DeMint's successor at noon EST on Monday, her spokesman posted on Twitter.
Haley called former state Attorney General Henry McMaster, one of the short list members, at 10 p.m. ET Sunday night to tell him he was not the pick to replace DeMint, a Republican source told CNN.
DeMint announced earlier this month he would resign his from his Senate seat by January 1 to lead The Heritage Foundation, a conservative think tank in Washington.