In his first American television interview, Edward Snowden defended his disclosure of the American government's use of surveillance programs to spy on its own people, and described himself as a patriot for trying to stop violations of the Constitution.
Online advertisements have become so dangerous that even the U.S. Intelligence Community blocks them.
From documents obtained by the ACLU, it turns out that the NSA illegally collected call records after it promised to stop collecting them.
In an exclusive interview with chief intelligence correspondent Catherine Herridge, the new head of NSA cybersecurity discusses evolving threats.