If Russia is behind the hacking of servers at the Democratic National Committee, the U.S. should prove it, former NSA contractor Edward Snowden said Monday.

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The whistleblower, who fled to Russia in 2013 to avoid extradition after he leaked secrets about U.S. surveillance programs, said policies set forth by the U.S. director of national intelligence often prevent the information from being shared. The biggest reason has been to protect knowledge of the existence of U.S. surveillance methods, especially a program Snowden exposed known as “XKeyscore” that allows intelligence operatives to surveil global Internet data.