His comments came after Mr Trump lashed out at the Republican in a series of tweets.
This latest dust-up comes as Trump is set to attend lunch Tuesday with lawmakers he spent much of the summer blasting for failing to enshrine his political agenda.
Meanwhile, a protester shouted and threw what appeared to be Russian flags at Mr. Trump, screaming "Trump is treason!" and "We should be talking about treason not tax cuts!" One positive outcome of the feud between Corker and Trump, however, is that it seems to be awakening more Republicans to the fact that their de facto leader is behaving like a child more than like a president. Trump makes his first visit to Capitol Hill to meet with Senate Republicans at their weekly meeting and the message is clear: Pass a tax cut. As the two strode side by side down a long hallway, a protester who had made his way into the press area shouted "Trump is treason!" and threw Russian flags in Trump's direction. A man identified as Ryan Clayton from Americans Take Action was recorded shouting "Trump is treason!" as he tossed Russian flags at the president.
The incident added to the chaos of the day.
Later Tuesday morning, in an interview with CNN, Corker said Trump "has great difficulty with truth on many issues" and that, if he had it to do over, he would not support him for president. "His governing model is to divide and to attempt to bully and to use untruths". "I think that's the best way for us to have success".
Trump, predictably, responded in kind.
Flake and Corker, whose critiques followed denunciations - none by name - of Trump by Sen. Corker. "I would like for him to just leave it to the professionals for a while and see if we could do something constructive for our country".
After a Trump attack on October 8, Corker responded on Twitter: "It's a shame the White House has become an adult day care center".
Trump contended, also in a tweet, that Corker decided not to seek another term next year because he "couldn't get re-elected". "Now we move forward!" Privately, Senate GOP aides were expressing dismay at a dispute that could only frustrate their already stymied efforts to produce results to take to voters in next year's midterm elections. The gathering was billed as a chance for Trump to discuss the GOP's effort to cut taxes, but his back-and-forth with Corker and his penchant for veering from one subject to another could lead to an unpredictable afternoon.
"I know the President want to get tax reform", Ryan said.
"I don't know why he lowers himself to such a low, low standard and debases our country in the way that he does, but he does", Corker went on to tell reporters at the Senate.
The GOP tax reform plans are still conceptual.
"I was not a part of the lunch discussion".
Trump has blamed them all for the failure of his agenda, saying it's not his fault. His attacks on Corker and other senators are not helping his cause.
As Perdue and Inhofe shrugged off the signs of GOP discontent, they were joined by many other Republicans in focusing more on unity with the President on tax reform.
The morning kicked off with another confrontation between the president and Senate Foreign Relations Chairman Bob Corker of Tennessee that resulted in the senator admitting regret for supporting Trump for president a year ago. John Thune, S.D., the third-ranking Republican senator. Trump's tax plan would require multinationals to bring those profits into the United States, but give multinationals a sharp tax cut on them.
According to a report from The New York Times, Republicans and lobbyists involved on the tax plan are concerned about the possibility of Trump swaying on various elements of the plan.
Corker referenced a recent presidential tweet ruling out any changes to the way tax-deferred income can be contributed to 401 (k) retirement plans.