From a wiki page (https://en.wikipedia.org/wiki/Mary_Jo_White):
White became Acting United States Attorney for the Eastern District of New York in December 1992, and in March 1993 was appointed by President Bill Clinton as U.S. Attorney for the Southern District...
After President Bill Clinton’s controversial last-day presidential pardons, she was appointed by new Attorney General John Ashcroft to investigate Marc Rich’s pardon.[2]
She investigated Marc Rich’s pardon? That explains a lot!