It appears President Trump is still holding a grudge against his former attorney general.

While Republicans have indicated that they believe Jeff Sessions might be the party’s best chance at reclaiming the Senate seat in Alabama from Sen. Doug Jones (D-AL), Trump’s “not on board” with the plan, according to Sen. Richard Shelby (R-AL).

“I did talk to (Sessions). I talked to the President about it to … about if Sessions ran, he was not encouraging,” Shelby told the Hill Thursday. “How do I say it? He was not on board, Okay?”

Shelby wouldn’t “get into” why Trump was so opposed to the idea, but the President has been frustrated with his former attorney general for some time– ever since Sessions recused himself from the Russia investigation. Shelby said Sessions would be a “formidable” candidate, especially when it comes to running against accused child molester Roy Moore, whom Trump and prominent Republicans attempted to thwart from running, to no avail.

“We talked about every possibility. We talked about the seat, basically, you know how to win the seat,” Shelby told the Hill. “I think he would be formidable but he would (have) multi-battles. He might be having to struggle if the President was against him.”