Republican presidential nominee Donald Trump said he doesn’t want Anderson Cooper to moderate a presidential debate because he would be unfair.

In a new interview with Washington Post reporter Robert Costa, Trump made an “unprompted” comment about the CNN host.

{mosads}“I don’t think Anderson Cooper should be a moderator, because Anderson Cooper works for CNN and over the last couple of days, I’ve seen how Anderson Cooper behaves,” Trump said. “He’ll be very biased, very biased. I don’t think he should be a moderator.”

Trump said he would participate in the debate but accused CNN of having a bias in favor of his Democratic rival, Hillary Clinton.

“CNN is the Clinton News Network and Anderson Cooper, I don’t think he can be fair,” Trump added.

The moderators for the three presidential debates were revealed by the non-partisan Commission on Presidential Debates earlier this month.

Cooper and ABC’s Martha Raddatz will team up to cover the town hall-style debate on Oct. 9. NBC’s Lester Holt will moderate the first debate, on Sept. 26, and Fox News’s Chris Wallace will host the third debate, on Oct 19.