Republican Sen. Bob Corker fired back at President Trump on Sunday, after the president claimed the Senate Foreign Relations Committee chairman "begged" for his endorsement before deciding not to run for re-election in 2018.

"It's a shame the White House has become an adult day care center. Someone obviously missed their shift this morning," Corker, R-Tenn. tweeted.

Trump continued his feud with Corker early Sunday morning in a series of tweets attacking the Tennessee senator.

"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.

Corker, who announced last month that he would not seek re-election, "didn't have the guts to run," Trump continued.

Trump's tweets come days after Corker said he was standing by his criticism of the president as incompetent for his response to the violence in Charlottesville two months ago.

Corker also said last week that Secretary of State Rex Tillerson, Defense Secretary Jim Mattis and White House chief of staff John Kelly are saving the "country from chaos."