Roger Stone, a longtime friend and former top adviser to Donald Trump, allegedly ran a sprawling network of fake Facebook accounts starting in 2016, according to newly unsealed FBI search warrants.

The search warrants, published in response to a joint petition from five news outlets, also report that Stone communicated with WikiLeaks' Julian Assange as early as 2017.

A source identified as Stone's "right-hand man" told the FBI that Stone used the fake Facebook accounts to circulate WikiLeaks stories and, later, to defend himself against charges of Russian collusion.

Stone was sentenced to 40 months in prison for lying to Congress and witness intimidation, but was never charged with aiding Russia in its attempt to influence the 2016 election.

Stone denied running the accounts in a statement to Business Insider.

Visit Business Insider's homepage for more stories.

Roger Stone allegedly bought hundreds of fake Facebook pages in 2016, which he used to circulate news articles that would damage his political rivals and, later, to defend himself against charges of Russian collusion, according to newly unsealed FBI records.

The FBI unsealed over 30 search warrants into Stone' s communications this week in response to a joint petition from The New York Times, CNN, the Associated Press, The Washington Post, and Politico. Stone was under investigation as part of a federal probe into Russia's attempts to influence the 2016 election.

Stone, a longtime friend and former top adviser to President Donald Trump, was never found guilty of colluding with Russia but was sentenced to 40 months in prison for lying to Congress and witness intimidation during the probe. He recently said he's "praying" that Trump will pardon him before he begins serving his prison sentence.

In a statement to Business Insider, Stone denied that he ever created or directed anyone to create fake Facebook pages, calling the allegation "categorically false." He added that the newly-released FBI warrants "prove no crimes."

"I have no trepidation about their release as they confirm there was no illegal activity and certainly no Russian collusion by me during the 2016 election. There is, to this day, no evidence that I had or knew about the source or content of the WikiLeaks disclosures prior to their public release," Stone said in the statement. "[Former US Special Counsel Robert] Mueller and his corrupt minions conducted a legal proctological exam of every aspect of my life and could find no evidence whatsoever to support any of these charges."

According to the FBI records, a source who described himself as a former "right hand man" to Stone told law enforcement that in 2016, Stone told him to buy hundreds of fake Facebook accounts, including both new and existing accounts, with instructions to make them seem like real accounts.

In the years that followed, the accounts allegedly bought dozens of ads on Facebook to promote stories including Wikileaks' publication of emails stolen from Hillary Clinton campaign manager John Podesta. Later, as Stone himself became a focus of the federal Russia probe, the fake Facebook accounts bought ads defending Stone.

Ads bought by the Facebook pages had titles including "Stone Rebuts Charge of Russian Collusion" and "I am not in touch with Russians..." according to excerpts published in the FBI warrants.

Stone's alleged use of Facebook pages violates the social media's policy against coordinated inauthentic behavior. A Facebook spokesperson did not immediately respond to a request for comment.