What do officials know about the attempted morning attack of a New York subway and the motives of the alleged bomber? Director Rasmussen joins Judy Woodruff to discuss the difficulties of preventing such attacks and the chances of another 9/11-style event.

Closing out his tenure as director of the National Counterterrorism Center, Nicholas J. Rasmussen discusses the evolving challenges of a complex terrorism threat environment. Carnegie President William J. Burns moderates.

After working under three presidents, Nick Rasmussen is stepping down as director of the National Counterterrorism Center. In an exit interview, he tells NPR's Mary Louise Kelly how terrorism threats have changed since the Sept. 11, 2001 attacks.

Click here to download Acting Director of Intelligence Lora Shiao testimony "Adapting to Defend the Homeland against the Evolving International Terrorist Threat"

Click here to download Director Nicholas Rasmussen testimony "Keeping America Secure in the New Age of Terror"