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.) on Thursday said President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE would “do himself a big favor” if he stayed off television after an interview in which Trump suggested that cooperating with prosecutors in a plea deal should be illegal.

"I think the President would probably do himself a big favor if he would stay off television and focus on some of the issues we have to deal with,” Corker said, according to NBC News. “I think he hurts himself when he says things like that."

In an interview that aired Thursday on "Fox & Friends," Trump attacked his former personal attorney Michael Cohen for reaching a plea agreement with prosecutors in New York and pleading guilty to eight counts, including campaign finance violations, in which he implicated the president.

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"If somebody defrauded a bank and he’s gonna get 10 years in jail, or 20 years in jail, but you can say something bad about Donald Trump and you’ll go down to two years or three years, which is the deal he made, in all fairness to him most people are going to do that," Trump said. "It’s called flipping, and it almost ought to be illegal.”

Without providing evidence, Trump also said that he’s often seen individuals who flip “make up stories” and “just make up lies.”

Corker also warned the president against firing Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE.

According to NBC News, Corker said “it would be very harmful to his own situation” if Trump fired Sessions and that he thinks Trump “understands he’d be in great trepidation if he were to fire Sessions.”