Conservative author and conspiracy theorist Jerome Corsi on Wednesday said that special counsel Robert Mueller's team is "harassing" his family as part of the investigation into possible collusion between Russia and the Trump campaign in 2016.

In an appearance on Fox Busines Network, Corsi alleged that the FBI is knocking on his stepson's door and using surveillance vans to follow his family.

"I've got evidence that the FBI and Mueller's team are now harassing my family," Corsi said on the network's primetime show "Trish Regan Primetime."

"They're doing door knocks on my stepson, they're parking surveillance vans with two agents in it outside the places where various members of my family work. My children have done nothing wrong. My wife - I've been married to for 27 years. And now, what are they going to try to make them criminals? Harassing my family is beyond bounds and I won't stand for it." Corsi added.

Mueller is conducting an ongoing investigation into Russia's interference in the 2016 presidential election as well as possible collusion between Russia and President Trump's campaign.

Corsi, an associate of longtime Trump ally Roger Stone, said in November that he rejected a plea deal offer from the special counsel on a charge of lying to investigators that would have allowed him to avoid prison.

"My decision to reject the special counsel offer was not made anticipating a pardon, I have no reason to believe or anticipate that President Trump would pardon me," Corsi said The Hill.

Corsi and Stone have been a focus of Mueller's probe over suspicion of coordinating the release of hacked documents damaging to the Democratic National Committee and 2016 Democratic presidential nominee Hillary Clinton with WikiLeaks in 2016.

Draft court documents from the special counsel's team obtained by The Hill show that prosecutors allege that Corsi made false statements during a September interview.

The documents claim that Corsi initially told investigators that he declined a request from an individual, whom Corsi identified as Roger Stone, to get in touch with WikiLeaks about "pending ... emails."

However, the documents state that Corsi later replied to Stone, "Word is friend in embassy plans 2 more dumps. One shortly after I'm back. 2nd in Oct. Impact planned to be very damaging," appearing to refer to WikiLeaks founder Julian Assange and future releases.

Corsi and Stone both deny being in touch with Assange. Corsi has said he's instructed his attorney to prepare to file criminal charges against Mueller.

"So if you want to know what I think of him, I think he's a political hack and a criminal. I'm going to file charges with the Department of Justice. My attorneys are preparing it right now. We're going to file it with [acting Attorney General Matthew] Whitaker," Corsi told Hill.TV in November.