Fox News host Tucker Carlson announced on Tuesday that America doesn’t have a white supremacist problem and called the very notion a “hoax.”

CNN’s Don Lemon couldn’t believe it.

Lemon rolled a clip of Carlson’s rant, in which he claimed “the whole thing is a lie” and insisted that white supremacy is “not a real problem in America.”

Lemon came back from the clip with nothing to say. After six seconds of silence, he let out an exasperated sigh.

“Was that not the dumbest thing you’ve ever heard?” he finally asked.