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.) said that President Trump’s threats to other countries could put the U.S. “on the path to World War III.”

Corker told The New York Times Sunday that Trump was treating the presidency like “a reality show” and acts “like he’s doing ‘The Apprentice’ or something.”

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“He concerns me,” Corker told the Times. “He would have to concern anyone who cares about our nation.”

Corker’s comments come after Trump attacked the senator in a series of tweets on Sunday.

“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.

“…Hence, I would fully expect Corker to be a negative voice and stand in the way of our great agenda. Didn't have the guts to run!” Trump added.

“It’s a shame the White House has become an adult day care center. Someone obviously missed their shift this morning,” Corker fired back in a tweet earlier Sunday.

Corker disputed Trump’s account to the Times, saying that Trump had asked him to run and promised to endorse him if he did.