As departing Republican Sen. Bob Corker has continued to praise the Democrat running to replace him, President Donald Trump is making clear that he's firmly in Republican Marsha Blackburn's corner. 

"@MarshaBlackburn is a wonderful woman who has always been there when we have needed her," he tweeted. "Great on the Military, Border Security and Crime. Loves and works hard for the people of Tennessee. She has my full endorsement and I will be there to campaign with her!"

Trump won Tennessee by 26 points in 2016, winning 92 of 95 counties. But Democratic candidate and former governor Phil Bredesen is still well-regarded in the state, and one early poll has shown him with the lead. 

Corker, who has at times been an ally and a thorn in the side of the president, has donated to Blackburn's campaign but has also said he will not campaign against Bredesen. 

"I worked very closely with him for years, and he was a very good mayor, very good governor, very good businessperson and look, I'm not going to campaign against someone who, you know, I've been a friend with and worked with," he said Wednesday.