You won’t believe how Donald Trump reacted to Fox’s Charles Krauthammer saying he “deserved” to be at the top of a list of candidates Republicans say they will never vote for.

On Special Report, panelist Krauthammer brought up the “tremendously interesting poll.” At the top of the list, more than 20 points above his nearest competitor, was birther Trump.

“It is led by Donald Trump, with a deserved 59%,” Krauthammer noted.

Host Bret Baier tried to run interference. He asked Krauthammer, “Do you have to” say Trump “deserved” the 59%?

But Krauthammer doubled down. “This is an open forum and we have free speech,” he retorted. “Yes, a well deserved, I would say an impressive 59%.”

Well, those were fightin’ words for Trump!

He let forth a series of tweets attacking Krauthammer as a “dummy” and more.

In a very funny article, The Washington Post details Trump's long history of such adolescent tweeting. Author Amber Phillips wrote, “When it comes to childish put-downs directed at journalists, Donald Trump is a king among men. (And that’s saying something: Scroll through our Twitter replies for some very interesting commentary.)

I’m hardly a fan of Krauthammer. But one thing he ain’t is stupid.

Watch Krauthammer’s comments above, from the June 4 Special Report.