Jerome Corsi, an associate of Republican operative and Trump ally 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, offered testimony Friday to a grand jury convened on behalf of 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 probe, according to a report by ABC News.

Corsi, a former Washington bureau chief for Infowars, is one of at least 11 Stone associates the special counsel contacted. He appeared at the U.S. District Court House in Washington, ABC News reported.

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Corsi was scheduled to testify earlier this month, but that plan was put on hold.

Mueller is investigating Stone’s alleged contacts with Wikileaks, the group famous for publishing classified government documents. Stone’s interactions with WikiLeaks came under scrutiny after the group released emails during the 2016 presidential election that had been hacked from the Democratic Party and Clinton campaign chairman John Podesta.

U.S. intelligence agencies maintain that Russian operatives hacked the Democratic email servers and used WikiLeaks to release the information online.

The special counsel is investigating if Stone had any advance knowledge of the 2016 document dump after Stone sent out multiple tweets lining up with the reveal of the emails.

“Wednesday @HillaryClinton is done. #Wikileaks,” Stone, whose Twitter account has since been suspended, tweeted on Oct. 1, 2016. WikiLeaks began releasing documents stolen from Podesta on Wednesday, Oct. 7.

Stone has denied any advance knowledge of WikiLeaks’ document dumps and WikiLeaks has denied any ties to Russia or its efforts to meddle in the 2016 election.