Transition of power

Obama's national security challenge

Shortly before inauguration day, the Bush administration national security staff will walk the incoming Obama staff through what they need to know should an emergency happen. Experts say the nation is most vulnerable to attack in the early months of a new presidential administration.

Guests

• Peter Bergen: CNN's national security analyst, and a fellow with the New American Foundation and New York University Center on Law and Security.

Resources

• Peter Bergen's Web site