Kristin Davis, the Manhattan Madam who went to prison and was connected to former New York Governor Eliot Spitzer, is being subpoenaed in the Robert Mueller investigation

Davis worked for former Trump aide Roger Stone for a decade, and had numerous interactions with Stone and Andrew Miller

https://www.tmz.com/2018/07/20/manhattan-madam-kristin-davis-subpoenaed-robert-mueller-trump/