Good question. Was it Lieu?
Since we don't know exactly when they came up with the 9 year sentencing recommendation, and since Jessie Liu worked as United States Attorney for the District of Columbia from September 24, 2017 – January 31, 2020, it's possible she was involved. I just checked, and it is the the U.S. Attorney’s Office for the District of Columbia that is handling the case against Roger Stone.