This is significant, because her warning letter (reproduced from TPM below) specifically mentions issues of oversight.
Harman has been trying to get her letter declassified for some time.
February 10, 2003
Mr. Scott Muller
General Counsel
Central Intelligence Agency
Washington, DC 20505Dear Mr. Muller:
Last week’s briefing brought home to me the difficult challenges faced by the Central Intelligence Agency in the current threat environment. I realize we are at a time when the balance between security and liberty must be constantly evaluated and recalibrated in order to protect our nation and its people from catastrophic terrorist attack and I thus appreciate the obvious effort that you and your Office have made to address the tough questions. At the briefing you assured us that the [redacted] approved by the Attorney General have been subject to an extensive review by lawyers at the Central Intelligence Agency, the Department of Justice and the National Security Council and found to be within the law.
It is also the case, however, that what was described raises profound policy questions and I am concerned about whether these have been as rigorously examined as the legal questions. I would like to know what kind of policy review took place and what questions were examined. In particular, I would like to know whether the most senior levels of the White House have determined that these practices are consistent with the principles and policies of the United States. Have enhanced techniques been authorized and approved by the President?
You discussed the fact that there is videotape of Abu Zubaydah following his capture that will be destroyed after the Inspector General finishes his inquiry. I would urge the Agency to reconsider that plan. Even if the videotape does not constitute an official record that must be preserved under the law, the videotape would be the best proof that the written record is accurate, if such record is called into question in the future. The fact of destruction would reflect badly on the Agency.
I look forward to your response.
Sincerely,
JANE HARMAN
(emphasis mine)
This letter bolsters the case for obstruction, either of justice or of a federal investigation.