David Letterman accused real estate mogul, Celebrity Apprentice star and possible political candidate Donald Trump of being a racist on last night’s edition of CBS Late Show.

Letterman was talking to guest Dr. Phil, who’s apparently friends with Trump, when he said this about Trump’s suggestion that President Obama somehow unfairly got into Harvard Law School:

“It’s all fun, it’s all a circus, it’s all a rodeo, until it starts to smack of racism. And then it’s no longer fun,” Letterman said.

“So you thought it was racism?” Dr. Phil asks.

“Well, yes,” Letterman replied. “Do you consider him to be a racist?”

“I do not,” Dr. Phil responded.

“How can you say things like that if you’re not a racist?” Letterman asked.

“I don’t think he always thinks everything through,” Dr. Phil said. “I think sometimes he’s a little from the hip, and I don’t think he has a racist bone in this body.”

Letterman added that if Trump comes on his show again, he “ought to be prepared to apologize.”

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