Gen. Keith Alexander is director of the National Security Agency, whose duty, his office has said, "requires us to attempt to collect terrorist communications wherever they traverse global infrastructure."
U.S. Army Gen. Keith Alexander, director of the National Security Agency and commander of U.S. Cyber Command, speaks during a conference at the Ronald Reagan Building, in October.
Mark Wilson/Getty Images
Brazilian President Dilma Rousseff was angered by reports that the National Security Agency was spying on her. She has called for giving individual countries greater control over the Internet.
This photo released by the Kenya presidency shows the collapsed upper car park of the Westgate Mall in Nairobi last week after al-Shabab terrorists attacked with explosives and guns, killing more than 60 people.
Kenya Presidency via AP
Edward Snowden's leaks about the NSA's secret surveillance program have pushed the agency to expedite planned reforms ahead of schedule, according to NSA officials.