Norman Ornstein, a Congressional expert at the American Enterprise Institute said in May 1998, "Barring some dramatic change, I think the Burton investigation is going to be remembered as a case study in how not to do a congressional investigation and as a prime example of investigation as farce." In a May 5, 1998, letter to other Republicans on the committee, Burton admitted that "mistakes and omissions were made" in tape transcripts released to the public of phone calls made by Webster Hubbell. A committee investigator who was an advocate of releasing the tapes resigned at Burton's request.