President Trump ripped 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.) early Sunday, saying the GOP lawmaker "begged" him to endorse his reelection bid and announced his retirement after the president withheld his support.

"Senator Bob Corker 'begged' me to endorse him for re-election in Tennessee. I said 'NO' and he dropped out (said he could not win without my endorsement). He also wanted to be Secretary of State, I said 'NO THANKS.' He is also largely responsible for the horrendous Iran Deal!" Trump tweeted.

Senator Bob Corker "begged" me to endorse him for re-election in Tennessee. I said "NO" and he dropped out (said he could not win without... — Donald J. Trump (@realDonaldTrump) October 8, 2017

..my endorsement). He also wanted to be Secretary of State, I said "NO THANKS." He is also largely responsible for the horrendous Iran Deal! — Donald J. Trump (@realDonaldTrump) October 8, 2017

"Hence, I would fully expect Corker to be a negative voice and stand in the way of our great agenda. Didn't have the guts to run!" the president continued.

...Hence, I would fully expect Corker to be a negative voice and stand in the way of our great agenda. Didn't have the guts to run! — Donald J. Trump (@realDonaldTrump) October 8, 2017

Corker, who is the chairman of the Senate Foreign Relations Committee, announced last month that he would not seek reelection in 2018.

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Corker was the first senator to announce that he will retire for the 2018 primaries and has become increasingly critical of Trump.

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He fired back on Saturday that Trump's White House has become "an adult day care center."

"Someone obviously missed their shift this morning," Corker tweeted.

It's a shame the White House has become an adult day care center. Someone obviously missed their shift this morning. — Senator Bob Corker (@SenBobCorker) October 8, 2017

Last week, the Tennessee Republican said Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE, Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and chief of staff John Kelly John Francis KellyMORE are protecting the country from “chaos.”

Trump allies, such as former White House chief strategist Stephen Bannon, have expressed interest in presenting primary challenges to establishment Republicans in Congress.

-Updated 11:22 a.m.