Prostitution mogul Kristin Davis, nicknamed the "Manhattan Madam," will testify before 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 grand jury this week, a source told NBC News.

Mueller's team questioned Davis last week about her close relationship with Trump campaign adviser 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, NBC also reported on Monday, citing the source with knowledge of the matter. Stone is the godfather of Davis's son.

Davis, who claims her high-end prostitution ring served about 10,000 powerful figures in New York City, has repeatedly insisted she does not know about collusion between the Trump campaign and Russia, the subject of Mueller's probe.

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Davis, who was released from a two-year jail sentence in May 2016, has said she could not know about Russian collusion because she was in prison during most of Trump's presidential campaign. Davis was arrested for allegedly selling drugs to a federal informant.

Four sources told CNN last week that Mueller's team is interested in Davis's relationship with Stone.

Stone last month said he is “probably” the unnamed person referenced in Mueller’s indictment against 12 Russian intelligence officers. Mueller's report mentions an individual "who was in regular contact with senior members of the presidential campaign of Donald J. Trump” and exchanged Twitter messages with Guccifer 2.0, an online persona allegedly used by the Kremlin officials.

Roger Stone: I probably am the person in the indictment https://t.co/zOWDTXBFFy — Christopher C. Cuomo (@ChrisCuomo) July 14, 2018

"Kristin Davis is a long time friend and associate of mine," Stone said in a statement for CNN. "I am the Godfather to her 2 year-old son. She knows nothing about Russian Collusion, WikiLeaks collaboration or any other impropriety related to the 2016 election which I thought was the subject of this probe. I am highly confident she will testify truthfully if called upon to do so."