Donald Trump’s increasingly creepy obsession with Fox News star Megyn Kelly is starting to concern Fox News.

“Donald Trump’s vitriolic attacks against Megyn Kelly and his extreme, sick obsession with her is beneath the dignity of a presidential candidate who wants to occupy the highest office in the land,” Fox News said this afternoon in a statement.

As he has many times since announcing his candidacy, Trump this afternoon lit into Kelly on Twitter, sounding more and more like an eight-year-old confused by his feelings for his third-grade teacher and lashing out:

Everybody should boycott the @megynkelly show. Never worth watching. Always a hit on Trump! She is sick, & the most overrated person on tv. — Donald J. Trump (@realDonaldTrump) March 18, 2016

“Megyn is an exemplary journalist and one of the leading anchors in America – we’re extremely proud of her phenomenal work and continue to fully support her throughout every day of Trump’s endless barrage of crude and sexist verbal assaults,” Fox News continued.

One day earlier, Kelly tweeted this:

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Half of U.S. women have 'very unfavorable' view of Trump: poll https://t.co/OVfQjKAs2l via @Reuters# — Megyn Kelly (@megynkelly) March 17, 2016

It had been three full days since Trump stalked Kelly on Twitter with a spew of his original material and retweets, as he awaited voting results on Super Tuesday 3. On his own, Trump came up with this:

Watching other networks and local news. Really good night! Crazy @megynkelly is unwatchable. — Donald J. Trump (@realDonaldTrump) March 16, 2016

Though Trump’s attack on Kelly has been going on for months, today’s tweet and Fox News’ response take the situation to a new level. Even FNC’s rivals gobbled it up. On CNN, for instance, John King said he’d be hard pressed to “find another word for if it not an ‘obsession’,” Anderson Cooper said it fueled the narrative that Trump is a misogynist and too thin-skinned to be president and marveled that FNC would suggest Trump is maybe “not fit to be president.” But conservative columnist/Trump supporter Kayleigh McEnany insisted it “plays really well with the Republican base any time you attack the media.”

Trump’s Kelly tirade started back in August when, at the first GOP debate, she asked him, right out of the gate, “You’ve called women you don’t like ‘fat pigs,’ ‘dogs,’ ‘’slobs’ and ‘disgusting animals.’ Does that sound to you like the temperament of a man we should elect as president? And how will you answer the charge from Hillary Clinton, who is likely to be the Democratic nominee, that you are part of the war on women?”

Apparently Kelly struck a nerve. Because, the next day he turned her into a household name, and led to one of the most discussed candidate comments of the election cycle to date, when he complained to CNN’s Don Lemon, of Kelly’s question-asking: “You could see there was blood coming out of her eyes, blood coming out of her…. wherever.”

Of course, that was before he took the stage at a GOP debate to assure America he’d never received any complaints about the size of his “hands,” trumping his talk about a female journalist’s menstrual cycle.

What followed the GOP frontrunner’s rumination about Kelly’s menstruation was a “surreal six months,” Kelly acknowledged last month on NBC’s Tonight Show. “I can no longer go on Twitter,” she added.