Donald Trump sure does obsess over Megyn Kelly, doesn't he. Yesterday, Trump tweeted to his followers, asking them to boycott Kelly's show on Fox News. He referred to her as "sick" and "overrated."

Fox News fired back with a statement that called The Donald "sexist."

CNN Money:

"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," the network said in its statement.

"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," the statement continued. "As the mother of three young children, with a successful law career and the second highest rated show in cable news, it's especially deplorable for her to be repeatedly abused just for doing her job."

Trump, who for seven months has tried to impugn the credibility of the Fox News host, had raised the stakes in a tweet on Friday.

"Everybody should boycott the @megynkelly show. Never worth watching. Always a hit on Trump!" the GOP frontrunner tweeted. "She is sick, & the most overrated person on tv."

Trump's campaign kept up the barrage Friday night, putting out a statement that said in part, "Fox News has begged Mr. Trump to do a prime time special to be broadcast on the Fox Network, not cable, with Megyn Kelly. He has turned them down."

Fox recently announced plans for Kelly to do a special on the broadcast network in May, but a Fox News spokesperson said Friday night, "No one associated with Megyn Kelly's upcoming Fox Broadcasting special reached out to Donald Trump for an interview."

A Fox representative made clear that neither Kelly nor Bill Geddie, the executive producer of the Fox program airing in May, ever reached out to Trump for an interview.

Kelly has kept quiet throughout the many attacks by Trump, a fact the Trump campaign noted in its Friday night statement.

"Unlike Megyn Kelly, who resorts to putting out statements via Fox News, Mr. Trump will continue to defend himself against the inordinate amount of unfair and inaccurate coverage he receives on her second-rate show each night," the campaign said.

A psychiatrist could have a field day analyzing this obsession. Is it a crush? Sexual desire? Whatever the reason for it, it makes Trump look petty and small.

Fox is not going to take the second highest rated anchor off the air to satisfy Donald Trump. In fact, Trump exposes his weakness when it becomes clear that Kelly's audience numbers don't budge despite his call for a boycott. In addition to narcissism, then, it appears the Donald is becoming infected with an exaggerated notion of his own power - meglomania. 

Like I said, a field day for a psychiatrist.