Judge Andrew Napolitano said that the "sole issue" in William Barr's confirmation hearing for attorney general Tuesday will be Special Counsel Robert Mueller.

Concerns have been raised about Barr due to his past comments about Mueller's Russia investigation, including a memo he wrote to the Justice Department last year that criticized the special counsel's inquiry into whether President Trump looked to obstruct justice.

President Trump announced Barr's nomination in December, a month after the resignation of former Attorney General Jeff Sessions.

According to a transcript of his prepared remarks, Barr -- who previously held the role of AG under President George H.W. Bush -- will tell senators during Tuesday's hearing that it's "vitally important" Mueller continues his probe.

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Barr also said, according to the transcript, that he has the "utmost respect" for the special counsel and that he should be allowed to complete his work.

"I don't know how the Democrats could reject that," Napolitano, a Fox News senior judicial analyst, said on Fox & Friends.

Napolitano said that Democrats will probably "try and do something" to hinder Barr's confirmation, due to their opposition to Trump.

"This is about as establishment and bipartisan a nomination as you could expect from this president," he said. "There is no reason why Bill Barr can't be Bob Mueller's boss."

At the end of the day, Napolitano added, Barr will be confirmed amid "tepid" opposition.

"Nobody's gonna come in and say 'he did this when he was a freshman at Yale.' I mean, this is not gonna be that kind of a hearing," he said, referencing the contentious confirmation process of Supreme Court Justice Brett Kavanaugh.

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