The top writer for Tucker Carlson’s Fox News program has resigned after it was revealed he’d secretly posted racist and sexist messages for five years on an online forum, CNN Business reported Friday.

Blake Neff, who worked for the right-wing Daily Caller before moving over to Fox News four years ago, had been posting the messages under the pseudonym CharlesXII and sometimes referred to work he did for Carlson in his messages, according to CNN.

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