A banner supporting Edward Snowden, a former CIA employee who leaked top-secret documents about sweeping U.S. surveillance programs, is displayed at Central, Hong Kong's business district, Wednesday, June 19, 2013. U.S. President Barack Obama defended top secret National Security Agency spying programs as legal in a lengthy interview, and called them transparent - even though they are authorized in secret. (AP Photo/Kin Cheung)

Associated Press
A banner supporting Edward Snowden, a former CIA employee who leaked top-secret documents about sweeping U.S. surveillance programs, is displayed at Central, Hong Kong's business district, Wednesday, June 19, 2013. U.S. President Barack Obama defended top secret National Security Agency spying programs as legal in a lengthy interview, and called them transparent - even though they are authorized in secret.  (AP Photo/Kin Cheung)
A banner supporting Edward Snowden, a former CIA employee who leaked top-secret documents about sweeping U.S. surveillance programs, is displayed at Central, Hong Kong's business district, Wednesday, June 19, 2013. U.S. President Barack Obama defended top secret National Security Agency spying programs as legal in a lengthy interview, and called them transparent - even though they are authorized in secret. (AP Photo/Kin Cheung)
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