Roger Stone joined Ed Henry on "Fox News @ Night" to react to speculation that he might be next in Special Counsel Robert Mueller's crosshairs.

Stone, a Republican strategist and former Trump campaign adviser, has come under scrutiny for his connections during the 2016 campaign to WikiLeaks and Russian hacker Guccifer 2.0.

Now, Mueller is bringing in a growing number of people from Stone's inner circle to testify before a grand jury, including Stone's longtime friend and colleague Kristin Davis, also known as the "Manhattan Madam."

The fact that Stone himself has not yet been called in for questioning has fueled speculation that he could potentially be a subject or a target of the investigation.

"Kristin Davis has no knowledge of Russian collusion or WikiLeaks collaboration or any other illegal act on my part pertaining to the 2016 election or anything else, nor does anybody else who's been paraded in front of the grand jury," Stone said.

Katrina Pierson Denies Omarosa's Explosive Claim About Alleged Trump N-Word Tape

Hannity: Prosecuting Manafort While Ignoring Clinton 'Disgrace to US System of Justice'

He said there is no evidence of him breaking the law and no witness who can testify truthfully to the contrary.

"I really do regard this -- as the president says -- as a witch hunt," Stone said of the Russia investigation.

Henry noted that former Trump campaign chairman Paul Manafort is potentially facing many years in prison on bank fraud and tax evasion charges that have nothing to do with Russian collusion.

"It's certainly possible that a runaway federal prosecutor could conjure up some offense on my part in an effort to pressure me to testify against the president or to just silence me because I have been, I think, an articulate critic of the partisan nature of the Mueller process," Stone said.

He doubled down that he committed no crime related to Russian collusion, the 2016 election or anything else.

"If they bring a case against me, it will be a fabricated case," Stone said. "And there's no circumstances whatsoever, Ed, in which I will testify against the president."

Stone drew particular scrutiny in 2016 for a tweet in which he stated it would soon be John Podesta's "time in the barrel." Shortly thereafter, WikiLeaks released a trove of the Clinton campaign chairman's Russia-hacked emails. 

Watch more from Stone above, including his response to Omarosa Manigault Newman calling him a "dark, shady character."

Maxine's Birthday Wish: Waters Says She Wants Trump 'Removed From Office'

McCarthy: Mueller's Biggest Mistake in Manafort Trial Was Giving 'Shameful' Plea Deal to Gates

The Five on New Mueller Poll: 'Tying the Justice System to an Election is a Terrible Idea'