WASHINGTON — President Trump on Sunday laced into Senator Bob Corker, a Republican whose support the president will need on tax reform and the future of the Iran nuclear deal, saying on Twitter that the senator had decided not to run for re-election next year because he “didn’t have the guts.”
“Senator Bob Corker ‘begged’ me to endorse him for re-election in Tennessee,” Mr. Trump wrote. “I said ‘NO’ and he dropped out (said he could not win without my endorsement).”
Mr. Trump also said that Mr. Corker had asked to be secretary of state. “I said ‘NO THANKS,’” Mr. Trump wrote.
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Mr. Corker offered a barbed response. “It’s a shame the White House has become an adult day care center,” he wrote on Twitter. “Someone obviously missed their shift this morning.”
The Tennessee senator has been a favorite target of Mr. Trump’s for months, after the senator, who was once a campaign supporter, became increasingly critical of Mr. Trump’s performance in the White House.
After a report last week that Secretary of State Rex W. Tillerson had once referred to Mr. Trump as a “moron,” Mr. Corker told reporters at the Capitol that Mr. Tillerson was one of three officials helping to “separate our country from chaos.”
In August, Mr. Corker had told reporters in Tennessee that the president “has not yet been able to demonstrate the stability nor some of the competence that he needs to demonstrate in order to be successful.”
Mr. Trump’s feud with Mr. Corker is particularly perilous given that the president has little margin for error as he tries to pass an overhaul of the tax code — his best hope of producing a major legislative achievement in the coming months.
If Senate Democrats end up unified in opposition to the promised tax bill, Mr. Trump would be able to lose the support of only two of the Senate’s 52 Republicans in order to pass it. That is the same challenging math that Mr. Trump and Senate Republican leaders faced in their failed effort to repeal and replace the Affordable Care Act.
Mr. Corker, who is outspoken about the nation’s mounting debt, has already signaled deep reservations about the Republican effort to pass a tax overhaul, saying he would not vote for a tax bill that adds to the deficit.
In addition, Mr. Corker, who leads the Senate Foreign Relations Committee, could play a key role if Mr. Trump follows through on his threat to “decertify” the Iran nuclear deal, kicking to Congress the issue of whether to restore sanctions on Tehran and effectively scuttle the pact.