William Binney - NSA whistleblower : Explains The Stellar Wind Program

From Reason.tv, NSA whistleblower William Binney is interviewed by Nick Gillespie regarding NSA data collection scheme known as Stellar Wind
William Binney is a 32-year veteran of the National Security Agency who helped design a top-secret program he says is broadly collecting Americans' personal data.
William Binney served in the NSA for over 30 years, including a time as director of the NSA's World Geopolitical and Military Analysis Reporting Group. Based on his experience and background, he estimates that the NSA has put together over 20,000,000,000,000 (20 trillion) "transactions" — phone calls, emails, and other forms of data — from Americans. Surprising as it may sound, it's entirely possible that this could include copies of almost all of the emails sent and received from most people who live in the United States.