In the first installment of our special limited series Intelligence Matters Presents: Remembering 9/11, host Michael Morell speaks with Stephen Hadley, who served as deputy national security advisor to President George W. Bush on the day of the September 11, 2001 attacks. Hadley and Morell walk through the reactions and responses of White House officials who scrambled to understand the scope and origin of the attacks in real time. They also discuss President Bush's early instructions to government agencies and his messages to the shocked and grieving nation.