“Snowden has enough information to cause harm to the U.S. government in a single minute than any other person has ever had,” Greenwald said in an interview in Rio de Janeiro with the Argentinean daily La Nacion.

“The U.S. government should be on its knees every day begging that nothing happen to Snowden, because if something does happen to him, all the information will be revealed and it could be its worst nightmare.”