Executing a perfect 180-degree turn, Newt Gingrich, one of President Donald Trump's top media surrogates, has begun attacking the legitimacy of Robert Mueller, the special counsel who was appointed to oversee the federal investigation of Russia's involvement in the 2016 presidential election.

"Republicans are delusional if they think the special counsel is going to be fair," the former speaker of the House wrote on Twitter early on Monday. "Look who he is hiring. Check FEC reports. Time to rethink."

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Less than a month before, however, Gingrich had lavishly praised Mueller, who formerly headed the FBI.

"Robert Mueller is superb choice to be special counsel. His reputation is impeccable for honesty and integrity. Media should now calm down," Gingrich tweeted on May 17.

Asked online about his change of mind, the Trump surrogate wrote that this was a "fair question" and that he had indeed modified his opinion.

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In a follow-up response, the former House speaker said his viewpoint had changed because of congressional testimony given last Thursday by James Comey, the former FBI director who had been fired, according to President Trump, for his management of the Russia inquiry. Since Friday Gingrich was criticizing Mueller's investigation in light of Comey's testimony

In particular, the former congressman and presidential candidate has cited Comey's statement that he had indirectly provided a journalist with details about a series of conversations he had with Trump about the FBI's Russia investigation. During his testimony, Comey said he leaked this information after his firing with the intent of triggering the appointment of a special counsel to take over the Russia investigation.

"This statement is tremendously important because it completely delegitimizes Robert Mueller's so-called independent investigation and reveals it as poisoned fruit," Gingrich wrote in his weekly newsletter on Friday.

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On Monday Gingrich repeated his denouncement of Comey's leak and also added that he believed that Mueller had been only hiring Democrats to assist him in his investigation. Gingrich did not mention that Mueller had been appointed in 2001 to lead the FBI by then President George W. Bush, a Republican.

Several prominent conservatives — mainly Trump supporters — have also come out against Robert Mueller.

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Gingrich wrote on Monday that the Trump-Russia inquiry was really the creation of the "deep state," a term that's recently been used by supporters of the current president to refer to federal bureaucrats who favor liberal policies.

"Comey’s testimony — and the situation he orchestrated around it — really show the depths to which the deep state will go — working around Congress, outside of even the federal process — to damage and undermine President Trump. And it perfectly illustrates how sick the system has become," he wrote.