The National Security Agency headquarters at Fort Meade, Md. Saul Loeb/Getty Images hide caption

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Saul Loeb/Getty Images

A checkpoint leading to the closed U.S. Embassy compound in the Yemeni capital, Sanaa, on Saturday. Mohammed Huwais /AFP/Getty Images hide caption

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Mohammed Huwais /AFP/Getty Images

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

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Glenn Greenwald/Laura Poitras/EPA/Landov

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

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Glenn Greenwald/Laura Poitras /EPA /LANDOV

WikiLeaks founder Julian Assange (left) and Ecuadorian Foreign Minister Ricardo Patino appear on a window of the Ecuadorian Embassy in London on June 16. Assange has been living at the embassy for the past year. Patino announced Sunday that Ecuador would consider giving asylum to former NSA contractor Edward Snowden. Frank Augstein/AP hide caption

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Frank Augstein/AP