A journalist who has interviewed Edward Snowden and seen some of the fugitive American leaker's data says Snowden still has information that could become the United States' "worst nightmare" if revealed.
Glenn Greenwald, "The Guardian" journalist who was the first to publish documents from Snowden, said in an interview: "Snowden has enough information to cause harm to the U.S. government in a single minute than any other person has ever had."
Speaking to the Argentinian newspaper "La Nacion," Greenwald added that Snowden has chosen not to release some information that could be damaging to Washington.
Snowden, who has been staying at Moscow airport for the past three weeks, said on July 12 that he is seeking asylum in Russia.
The United States wants to put Snowden on trial on espionage charges.
Based on reporting by Reuters and AFP