According to a Top Secret report from the Director of Central Intelligence, George Tenet, on March 19, 2004: “A SEIB [Senior Executive Intelligence Brief] article on August 7, 2001, ‘Bin Ladin Determined to Strike in US,’ underscored Bin Ladin’s desire to conduct terrorist attacks in the US homeland. It noted that the Millennium plot to bomb the Los Angeles airport might have been Bin Ladin’s first serious attempt to strike in the United States. It pointed out that al-Qa’ida members–including some who are US citizens–have resided in or traveled to the US for years, and the group apparently maintains a support structure that could aid attacks.”
– CIA, “DCI Report: The Rise of UBL and Al-Qa’ida and the Intelligence Community Response,” (Draft, CIA Analytic Report), The Central Intelligence Agency’s 9/11 File:, The National Security Archive, March 19, 2004