Guardian Newspaper Told To Destroy NSA Files For National Security [Getty Images]

LONDON, ENGLAND - AUGUST 21: A general view of the Guardian Newspaper offices on August 21, 2013 in London, England. It has been reported today that Prime Minister David Cameron had asked senior civil servant Sir Jeremy Heywood to contact the Guardian newspaper over protectively marked information leaked by Edward Snowden. (Photo by Bethany Clarke/Getty Images)

Getty Images News Bethany Clarke