Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) on Friday did not rule out the possibility of challenging President Trump in 2020.

“You know, I don’t know what I’m doing next Sunday,” the senator told reporters who asked about a possible presidential bid, according to The Associated Press.

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“The only thing that I’m thinking about right now over the next 14 months truly is doing the best job I can as a senator,” Corker said, according to Knox News. “And I think if you even begin thinking those things, everything you do becomes viewed through a different lens.”

Corker, who has become one of Trump’s strongest critics from within the Republican party, does not plan to seek reelection in 2018.

Since announcing he would not stay in Congress, he and Trump have traded various personal insults on Twitter.

Corker would not say whether he encourages a Republican primary challenge to Trump in 2020, but he has said that he would not support Trump’s reelection.

Another retiring GOP senator and Trump critic, Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.), last week made a similar comment suggesting he's leaving the door open to challenging the president.

"That's a long time away, and we'll deal with that when it comes to it," Flake told ABC's George Stephanopoulos, when asked if he was ruling out a 2020 campaign.