The New York Times on Monday released audio from an interview with Sen. Bob Corker (R-TN), who laid bare his concerns over Donald Trump’s behavior in a remarkable exchange over the weekend.

“Look, except for a few people, the vast majority of our caucus understands what we’re dealing with here,” Corker said of Trump. “Of course they understand the volatility that we’re dealing with and the tremendous amount of work that it takes by people around him to keep him in the middle of the road.”

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

The Tennessee republican went on to call the president out for “doing ‘The Apprentice’ or something” with how he manages the West Wing. He also argued Trump is putting us “on the path to World War III” with his handling of the situation n North Korea.

“A lot of people think that there is some kind of ‘good cop, bad cop’ act underway, but that’s just not true,” Corker said.

“I know he has hurt, in several instances, he’s hurt us as it relates to negotiations that were underway by tweeting things out,” Corker said of Trump’s notorious Twitter habit.

The interview, published Sunday, sparked an immediate reaction from the president.

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“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),” Trump tweeted. “He also wanted to be Secretary of State, I said “NO THANKS.” He is also largely responsible for the horrendous Iran Deal!”

Corker hit back at the president, posting on Twitter, “It’s a shame the White House has become an adult day care center. Someone obviously missed their shift this morning.”

It’s a shame the White House has become an adult day care center. Someone obviously missed their shift this morning. — Senator Bob Corker (@SenBobCorker) October 8, 2017

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Listen to the audio below, via the New York Times:

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