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Anyone who thinks Special Counsel Robert Mueller is winding down his investigation is mistaken, Judge Andrew Napolitano said Tuesday.

"I believe he's gearing up and the president remains in his crosshairs," the Fox News senior judicial analyst said on "Fox & Friends."

According to the New York Times, Mueller's investigators have interviewed George Nader, a businessman who advised United Arab Emirates leaders and visited the White House frequently last year. The probe is looking into whether the UAE bought political influence with the Trump campaign. 

The judge reiterated that the recent guilty plea by Rick Gates - the longtime business partner of indicted former campaign chairman Paul Manafort - has provided Mueller's team with a "treasure trove" of information.

Gates served as deputy campaign director, a transition official and frequently visited the White House, though he and Manafort were charged with offenses predating the campaign. 

Napolitano emphasized that Gates originally faced exposure to up to 40 years in prison based on all the charges Mueller filed. 

"He pleaded guilty and his exposure went from 40 years to three years. He obviously is prepared to tell them a lot of information to get that exposure to go way down. ... This is unbelievable," he said.

Napolitano also weighed in on the strange series of events that unfolded Monday surrounding fired Trump aide Sam Nunberg, who dared Mueller to arrest him and refused to go before a grand jury. 

"Why he did what he did yesterday, I don't know. Unless he really wanted to discredit himself or he really was inebriated," Napolitano said.

Watch the discussion above.

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