Newt Gingrich on Saturday ripped MSNBC's Joe Scarborough as a "prostitute" after the "Morning Joe" co-host attacked the former House speaker on Twitter this week.

"Well, now we know the degree to which Joe is a prostitute that apparently he would do that," the former Georgia Republican and Trump supporter told Jeanine Pirro on Fox News. "I wouldn’t.

"My record of being for Trump is clear," he continued. "I’m deeply committed to his presidency because I think we need to shake up Washington."

Scarborough on Thursday took to Twitter to bash Gingrich for his insistence that special counsel Robert Mueller is a partisan figure in the Russia investigation primarily because of his ties to former FBI Director James Comey.

It is hard to overstate how reckless the fanning of this anti-government conspiracy is the day after a mass shooting aimed at congressmen. https://t.co/zOkf4Pi91z — Joe Scarborough (@JoeNBC) June 15, 2017

Newt, whatever you think you're getting in return for obsequiously sliming an American hero, I guarantee you it's not worth it. Stop. — Joe Scarborough (@JoeNBC) June 15, 2017

Scarborough's second tweet appeared to jab at how Gingrich’s wife, Callista, has been nominated as the U.S. ambassador to the Vatican.

"There is a long continuum for my support for Republicans, from Ronald Reagan to the 'Contract for America' to Donald Trump," Gingrich said.