Senior Bush administration officials sternly cautioned the 9/11 Commission against probing too deeply into the terrorist attacks of September 11, 2001, according to a document recently obtained by the ACLU.
The notification came in a letter dated January 6, 2004, addressed by Attorney General John Ashcroft, Defense Secretary Donald H. Rumsfeld and CIA Director George J. Tenet. The ACLU described it as a fax sent by David Addington, then-counsel to former vice president Dick Cheney....
"In response to the Commission's expansive requests for access to secrets, the executive branch has provided such access in full cooperation," the letter read. "There is, however, a line that the Commission should not cross -- the line separating the Commission's proper inquiry into the September 11, 2001 attacks from interference with the Government's ability to safeguard the national security, including protection of Americans from future terrorist attacks."....
"The Commission staff's proposed participation in questioning of detainees would cross that line," the letter continued. "As the officers of the United States responsible for the law enforcement, defense and intelligence functions of the Government, we urge your Commission not to further pursue the proposed request to participate in the questioning of detainees."....
9/11 Commission members Thomas Kean and Lee H. Hamilton wrote that although US President George W. Bush had ordered all executive branch agencies to cooperate with the probe, "recent revelations that the CIA destroyed videotaped interrogations of Qaeda operatives leads us to conclude that the agency failed to respond to our lawful requests for information about the 9/11 plot."