Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE knocked the presidential debates as "a phony system," in an interview on Fox News Monday night, adding that NBC anchor Lester Holt is a Democrat.

In an interview on "The O'Reilly Factor" airing Monday night, the GOP nominee first praised Holt as a “professional” and noted his respect for the "Nightly News" anchor before claiming that all the moderators for general election debates are affiliated with the Democratic Party.

“I have respect for Lester,” Trump told Bill O’Reilly. “Lester is a professional, but we’ll see what happens.

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“By the way, Lester is a Democrat,” Trump continued. "It’s a phony system. They are all Democrats.”

The other presidential debate moderators are CNN’s Anderson Cooper, ABC’s Martha Raddatz and Fox News’s Chris Wallace.

“It’s a very unfair system," Trump said. "I’ve worked pretty well within the system. I guess by a lot of polls I’m leading, many of the polls and most of the polls.”

The first presidential debate of the general election will be held next Monday at Hofstra University in Hampstead, N.Y. The debate will include a focus on national security matters.

Trump also knocked Cooper and Raddatz in the Monday night interview, even while saying he will attend the debate they are co-moderating on Oct. 9 at Washington University in St. Louis.

“I’m not okay with Anderson Cooper because I think he treats me very unfairly at CNN,” Trump said. “I think he’s very unfair on CNN. I think CNN — they call it the Clinton News Network, that’s why the ratings aren’t doing very well, because who’s going to watch that?”

The real estate mogul called Wallace "fair" and "tough."

Trump has repeatedly called the general elections debates “unfair” and suggested last week that he should debate Clinton without any moderators.