(CNN) Special counsel Robert Mueller's team has reached out to the lawyer for Kristin Davis, famously known as the "Manhattan madam," a source familiar with the matter says.

Davis, who went to jail as a part of the scandal surrounding former Democratic New York Gov. Eliot Spitzer, has worked for Roger Stone, an outside political adviser President Donald Trump. They are close -- Stone is the godfather to Davis' son.

The same source said Davis did clerical and website work for Stone.

No subpoena has been issued yet, and the source did not have direct knowledge of why Mueller is interested in Davis.

Daniel Hochheiser, an attorney for Davis, said, "If the special counsel subpoenas her I will be representing her."

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