A top staffer on Megyn Kelly’s show has been fired after claiming there is a “toxic and demeaning” environment on set, rife with bullying and “abusive treatment.”

Kevin Bleyer was fired as a writer from “Megyn Kelly Today” this week after complaining that Kelly’s two top execs, Jackie Levin and Christine Cataldi, were bullying lower-level members of staff.

He was fired even though Kelly has made fighting abuse her personal crusade. Plus, in the wake of Matt Lauer’s firing, NBC ordered all staff to report workplace bad behavior, supposedly without fear or reprisal.

Bleyer — a multiple Emmy-winning former writer for “The Daily Show” and speechwriter for President Barack Obama — on Tuesday sent the email to NBC News human resources, and was fired shortly after.

He wrote in the memo, revealed by the Daily Mail, “I’m sad to say … the executive incompetence continues — as does the dysfunctional management, abusive treatment, maddening hypocrisy, staggering inefficiencies, acidic and deficient communication, and relentless scapegoating. Jackie Levin persists in creating a toxic and demeaning environment, and Christine Cataldi enables and reinforces it.”

He claims Cataldi regularly calls her assistant “an idiot,” and when he offered suggestions for the show, Levin called him a “f–king whiner.”

He continues: “It is a special absurdity — and what some find a hard-to-swallow injustice — that as a team we’ve been lauded for covering harassment stories daily on air, while the staff producing those stories feels so embattled and bullied themselves. As a result, veteran staffers are looking for the exits … Others have told me they’d ask to be reassigned elsewhere within NBC. I should add that many of those who have confided in me have made it plain: sensitivity training will not suffice. Their feeling is you can’t change these tigers’ stripes.”

He also adds that if he is fired for complaining, he is likely to sue: “I know Jackie and Christine previously intended (and perhaps still do intend) to replace staffers who offer any kind of pushback or speak up for themselves. I have personally overheard these conversations myself. If that happens — if there is any retaliation at all — I anticipate there may be further action through official legal avenues.”

There is no suggestion Kelly, who has used the show to speak out against harassment and workplace bullying, is involved in the “toxic” bullying on her show.

An NBC News rep said, “Jackie and Christine are being attacked unfairly. They are both excellent and experienced producers, and have the full support of everyone here.” Of Bleyer, “He was let go for one reason only: he was the wrong fit for this role, as a comedy writer at a morning news broadcast.”

Bleyer could not immediately be reached for comment.