Conservative author and conspiracy theorist Jerome Corsi said Monday that his stepson has been summoned to testify before a grand jury 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 investigation.

Corsi appeared on Fox Business Network, where he claimed Mueller's team has focused on texts exchanged between him and his stepson, Andrew Stettner. The messages include a conversation in which Stettner said a computer that had been on Corsi's desk had been "scrubbed."

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Corsi, who has been under scrutiny for months in Mueller's investigation into Russian interference in the 2016 presidential election, defended the messages as harmless.

“I think they think that Andrew was conspiring with me, as my computer expert, to destroy evidence,” he said. “They’re looking for anything they can find.”

The Washington Post, which first noted Corsi's comments to Fox, reported that an attorney for Corsi and Stettner declined to comment.

The special counsel's office declined to comment.

Mueller's investigation appeared to zero in on Corsi late last year, with a focus on his connections to Roger Stone Roger Jason StoneJustice IG investigating Stone sentencing: report Romney says Trump's protest tweets 'clearly intended to further inflame racial tensions' Bannon trial date set in alleged border wall scam MORE and WikiLeaks.

Stone, a former informal Trump campaign adviser, and Corsi have both denied being in contact with WikiLeaks founder Julian Assange.

Draft court documents from the special counsel’s team obtained by The Hill show that prosecutors allege Corsi made false statements during a Sept. 6 interview.

The documents claim that Corsi initially told investigators that he declined a request from an individual, whom Corsi identified as 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 Assange, who has been living in the Ecuadorian Embassy in London.

Corsi filed a lawsuit against Mueller last month alleging that the special counsel illegally surveilled him as part of the investigation.