Glenn Greenwald, left, and David Miranda after Miranda's arrival at Rio de Janeiro's International Airport on Aug. 19, 2013. Miranda had been detained for nine hours at London's Heathrow Airport. Authorities questioned him about Greenwald's reporting of the "NSA leaks." Ricardo Moraes /Reuters/Landov hide caption

itoggle caption Ricardo Moraes /Reuters/Landov

Travelers at Pearson International Airport in Toronto earlier this month. At an unnamed airport, Canada's spy agency tested a program that allowed them to track those who took advantage of free Wi-Fi. Aaron Harris /Reuters/Landov hide caption

itoggle caption Aaron Harris /Reuters/Landov

German Chancellor Angela Merkel and President Obama in September at the G20 summit in Russia. She and other leaders have objected after hearing that the NSA was listening to their phone calls. Anton Denisov/Host photo agency/Getty Images hide caption

itoggle caption Anton Denisov/Host photo agency/Getty Images

Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras /EPA/LANDOV hide caption

itoggle caption Glenn Greenwald/Laura Poitras /EPA/LANDOV

Glenn Greenwald (left) and David Miranda after Miranda's arrival early Monday at Rio de Janeiro's International Airport. Miranda had been detained for 9 hours at London's Heathrow Airport. Authorities reportedly questioned him about Greenwald's reporting of the "NSA leaks." Ricardo Moraes /Reuters/Landov hide caption

itoggle caption Ricardo Moraes /Reuters/Landov

Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras/EPA/Landov hide caption

itoggle caption Glenn Greenwald/Laura Poitras/EPA/Landov