South Carolina Sen. Tim Scott will endorse GOP presidential candidate Sen. Marco Rubio, Fox News has learned.

Scott will endorse the Florida senator on Tuesday morning, said a source with direct knowledge of the endorsement.

Scott, the only black GOP senator, was courted by several campaigns before deciding on Rubio, as reported first by Politico.

Republican Sen. Lindsey Graham, South Carolina’s other senator, has endorsed GOP presidential candidate Jeb Bush, a former Florida governor.

Rubio has also been endorsed by South Carolina GOP Rep. Trey Gowdy. South Carolina holds the first-in-the-South primary later this month.