"He would have to concern anyone who cares about our nation", he told the Times.
Corker said Trump acts "like he's doing The Apprentice or something".
Mr. Trump, who first attacked the respected member of the GOP, falsely stated that Corker is forced into retirement because he declined to endorse him for re-election next year. "Someone obviously missed their shift this morning", Corker tweeted. He chairs the Foreign Relations Committee, giving him a powerful voice on everything from the Iran nuclear deal to North Korea to America's response to Russian election meddling.
He also added that as the President of United States Trump has very little margin for error as he tries to pass the refurbish the tax laws.
Corker has one defender in this twitter mess, White House budget director Mick Mulvaney told NBC's Meet the Press: "I enjoy working with Sen".
In August, Corker said that Trump had not yet demonstrated "the stability nor some of the competence" he needed to be successful.More news: No chance of Liverpool title win with Klopp's current defence - Henchoz
He also blamed him for the Iran nuclear deal and accused him of being obstructionist towards "our great agenda". On Wednesday, the senator from Tennessee offered a veiled jab at Trump's abilities as commander-in-chief when he commended Secretary of State Rex Tillerson, White House Chief of Staff John Kelly, and Defense Secretary James Mattis for keeping the country from succumbing to "chaos" when talking to reporters.
Trump has long criticised the 2015 global nuclear pact, a signature foreign policy achievement of former president Barack Obama in which Iran agreed to reduce its nuclear program in exchange for easing of sanctions.
Corker added that Tillerson has not received the support he needs from Trump.
Trump tweets that Corker "Didn't have the guts to run".
Trump can't afford to lose Corker, even with Vice President Mike Pence's tie-breaking power. The president wants people who have different ideas and different perspectives so he can get a bunch of smart people to help him make a decision.
The lawmaker said that Trump regularly "tweets out things that are not true" and does not realize "the impact" his comments could have on the situation in the world.