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Former Solicitor General Kenneth Starr said Saturday on "Fox & Friends" that the Mueller probe into whether the Trump campaign colluded with Russia doesn't seem to be actually investigating that particular allegation.

Starr also served as the second special counsel in the Clinton-era Whitewater probe - an investigation into an Arkansas land deal that culminated in President Clinton being accused of perjury in regards to an affair with Monica Lewinsky.

"It looks increasingly like [Mueller] is investigating the Russian invasion of the United States political system and not collusion," Starr said.

"We're in sort of the black box behind the veil of ignorance," he said, adding that there is thus far no evidence of such collusion.

Regarding the debate over whether President Donald Trump should agree to be interrogated or interviewed by Mueller, Starr said he understands both sides.

He said that Trump's attorneys are correct in trying to protect the president from a potential "perjury trap," but added that it may be wise for the New Yorker to go ahead with any interview so as not to embroil him in grand jury case over a subpoena.

"That's very unseemly," Starr said of the latter possibility. "So right now, it's the Art of the Deal to negotiate the right kinds of terms and conditions of the interview."

Watch more above.

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