After Corker chose not to seek a third term this year. Blackburn quickly declared her candidacy and is expected to win the GOP’s Aug. 2 primary. The expected Democratic nominee is former Gov. Phil Bredesen.

Corker recently found himself in a bit of hot water after praising Bredesen and saying he’s “got real appeal.”

“He was a very good mayor [of Nashville], a very good governor, a very good business person,” Corker told reporters last week. “Look, I’m not going to campaign against someone who I’ve been friends with and worked with.”

Senate Majority Leader Mitch McConnell (R-Ky.) later pulled Corker aside and told him his comments risked the party losing its thin majority in the chamber in November, according to The Washington Post.

And a day after Corker’s comments, President Donald Trump tweeted his support of Blackburn.

On Sunday, Corker said he has donated to and intends to vote for Blackburn, but he again said he likes Bredesen.

“Look, I have sent the maximum contribution to the Republican nominee on our side. I have said I’m going to plan to vote for this person,” he said. “I was in a long meeting where … [reporters] were asking me about Gov. Bredesen. He is my friend. I’m not going to campaign against him, but I am supporting our nominee.”