In the late 90s, another President was under Investigation, Bill Clinton. The genesis of the Mueller Report was the Starr Report. The Starr report was known as the Independent Counsel Report. Unlike the Special Counsel Report from Mueller, the Independent Counsel Report had much more latitude and fewer restrictions in their investigation. In fact, it was thanks to this wide-ranging and lengthy (4 years) investigation that politicians decided to limit the scope of any future such investigations and the Independent Counsel Investigation turned into the Special Counsel Investigation....