President Bush says intercepting Americans' phone calls and e-mails without warrants is necessary in an age of terrorism and high technology. What effect does changing technology have on national security?
Timothy Naftali, intelligence historian at the University of Virginia's Miller Center of Public Affairs; author of Blind Spot: The Secret History of American Counterterrorism
Jim Bamford, author of Body of Secrets: Anatomy of the Ultra-Secret National Security Agency and The Puzzle Palace: Inside the National Security Agency, America's Most Secret Intelligence Organization
Paul Bradley, Ph.D., principal, data-mining technology at Apollo Data Technologies