Michael Scheuer, Former Chief, Bin Laden Unit, CIA, reported to Congress on April 17.
His statement is an interesting read. One quote:
The Rendition Program was initiated because President Clinton, and Messrs. Lake, Berger, and Clarke requested that the CIA begin to attack and dismantle AQ. These men made it clear that they did not want to bring those captured to the U.S. and hold them in U.S. custody.
President Clinton and his national security team directed the CIA to take each captured al-Qaeda leader to the country which had an outstanding legal process for him. This was a hard-and-fast rule which greatly restricted CIA’s ability to confront al-Qaeda because we could only focus on al-Qaeda leaders who were wanted somewhere. As a result many al-Qaeda fighters we knew were dangerous to America could not be captured.
Read the whole thing. I guess they never considered using Gitmo.