Jerome Corsi, a conspiracy theorist with connections to Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE, has been subpoenaed in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's Russia investigation, Corsi's lawyer told The New York Times on Wednesday.

Corsi will testify Friday in front of the grand jury in the investigation, according to the Times. His lawyer, David Gray, told the newspaper that he anticipates federal investigators will ask about his client's connections to Stone, who has long been subject to public scrutiny because of his connections to WikiLeaks and Guccifer 2.0, the hacking persona that Mueller’s team says was a front for Russian intelligence officers.

Stone is a longtime confidant of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.

Gray also told the Times that Corsi will cooperate with investigators.

“He fully intends to comply with the subpoena,” Gray said.

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Corsi is expected to testify the same day that Randy Credico, a political satirist and radio host, is scheduled to appear before the grand jury. Stone has said Credico was the intermediary who helped him communicate with WikiLeaks founder Julian Assange in 2016.

Corsi has worked for Infowars, the conspiracy site run by Alex Jones. Corsi has promoted conspiracy theories, including one that claimed former President Obama was born outside the United States.

Before he was a candidate for president, Trump regularly claimed that Obama's Hawaii birth certificate may not be legitimate. According to the Times, Corsi was one of the people contacted by Trump for information about Obama’s birth certificate.

Corsi has dealt with Stone “on and off for years,” the Times reported. The newspaper noted that during testimony in front of the House Intelligence Committee last year, Stone said he based a tweet he wrote off research provided by Corsi.

Corsi is the latest individual connected to Stone who has been asked by Mueller to testify.

Kristin Davis, the former head of an upscale prostitution ring who is also known as the “Manhattan Madam," testified last month before the grand jury. Davis has a longstanding relationship with Stone.

Stone predicted last month that he would soon be indicted by Mueller.

"Robert Mueller is coming for me," Stone said in an email asking supporters to donate to his legal defense fund. "I’m next on the crooked special prosecutor’s hit list because I’ve advised Donald Trump for the past 39 years. I am being targeted not because I committed a crime, but because the 'deep state' liberals want to silence me and pressure me to testify against my good friend President Donald J. Trump."

Updated at 2:07 p.m.