“On March 23 [2001], [counterterrorism czar Richard] Clarke warned [National Security Advisor Condoleezza] Rice of the existence of Islamic terrorist cells in the United States and his fear that they might use a truck bomb on Pennsylvania Avenue, resulting in the destruction of the West Wing [of the White House]. Truck bombs were their ‘weapons of choice,’ he wrote.”
– Philip Shenon, The Commission, Page 153