Glenn Greenwald: US Should Tread Carefully on Snowden, Leaker Has More Information That Could Damage U.S.

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National Security Agency whistleblower Edward Snowden possesses enough information to cause more damage to the United States government than "anyone else has ever had in the history" of the country, according to the journalist who first reported the former contractor's leaked documents.

Glenn Greenwald, a columnist for The Guardian newspaper who first reported on the intelligence leaks, told Argentinian newspaper La Nacion that the U.S. government should exercise extreme care with Snowden because he has the potential to do further damage to the country.