Quoted in Bob Woodward, Plan of Attack (2004). Tenet's response to President George W. Bush when the latter asked him, during a White House meeting, 21 Dec. 2002, about the evidence that Iraq possessed weapons of mass destruction.
"At the Center of the Storm: My Years at the CIA". Book by George Tenet and Bill Harlow (Chapter "They Want to Change History"), www.nbcnews.com. April 30, 2007.