On October 29, 2001, CIA Director George “Tenet briefed the president [Bush] and his senior advisers about a supposedly credible threat that terrorists might blow up a radiological bomb in Washington or New York. Following Tenet’s briefing, [Vice President Dick] Cheney, who had spent decades involved in ‘Continuity of Government’ exercise designed to ensure that elements of the American government could survive a nuclear attack, announced he was decamping for an ‘undisclosed location,’ which was typically Camp David.”
– Peter Bergen, The Longest War, Page 97