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American intelligence leaker Edward Snowden has more damaging information that could be a "nightmare" for the U.S. government, a journalist who first published his documents said, according to CNN. 

Glenn Greenwald of the Guardian told an Argentine newspaper, La Nacion, that releasing more information to hurt the United States is not Snowden's goal.

However, he said, Snowden has a "large number" of documents about software people use "without consciously agreeing to surrender their rights to privacy."

Snowden has given copies of the papers to several people, Greenwald told the paper, according to an English translation.

"The U.S. government should be on their knees every day praying that nothing happens to Snowden, because if something happens, all information will be revealed and that would be their worst nightmare," he said.

Others have suggested this before.

Kristinn Hrafnsson, a WikiLeaks spokesman, said last month that other secrets may be revealed.

"There is more to come," he said.