Not since the Bill Clinton sex scandals of the 1990s has the national conversation focused on a president’s personal life on so many fronts so often.

And not since the 1990s has sex been part of a federal investigation stirring calls for impeachment: Kristin Davis, known as the “Manhattan Madam” for the high-end prostitution ring she ran in the 2000s, says Robert Mueller’s prosecutors have notified her that he wants to interview her — probably about her close friend, Roger Stone, she tells the WashPost.