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 team has been asking former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE about his former business partner 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, according to ABC News.

Mueller in recent months has interviewed multiple people linked to Stone, a former Trump campaign adviser. Some of those people have also testified before the grand jury.

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"I am highly confident Mr. Manafort is aware of no wrong doing on my part during the 2016 campaign, or at any other time, and therefore there is no wrongdoing to know about,” Stone told ABC News. “Narratives to the contrary by some in the media are false and defamatory."

Manafort and his lawyers have visited Mueller's office at least nine times in the last four weeks, CNN reported on Wednesday.

Mueller is reportedly investigating whether Stone knew ahead of time that WikiLeaks was planning to release 2016 Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE's emails, which were stolen by Russian hackers, ABC News reported.

Stone at the time made public comments that indicated he had been in touch with WikiLeaks founder Julian Assange about the release of Clinton's emails.

Stone in August released a video denying that he had advance knowledge of the emails.

At the time, he sent out out an email to his supporters claiming Mueller was poised to indict him as part of the ongoing investigation into ties between the Trump campaign and Russia.

Stone on Wednesday told ABC News that it is "not outside the realm of possibility ... that [Mueller] may consider bringing some offense against me.”