A summary of US spying allegations brought about by Edward Snowden's leak of classified documents
Senior US lawmakers have rejected the idea of any clemency for the fugitive intelligence analyst Edward Snowden.
"Mr Snowden violated US law. He should return to the US and face justice," said White House adviser Dan Pfeiffer.
Mr Snowden asked for international help to persuade the US to drop spying charges against him in a letter given to a German politician.
Mr Snowden, 30, fled to Russia in June after leaking details of far-reaching US telephone and internet espionage.
He was granted temporary asylum, allowing him to live in Russia until July 2014.
In a surprise move last week, a German Green MP met Mr Snowden in Moscow and revealed the former intelligence contractor's readiness to brief the German government on National Security Agency's (NSA) spying.
How intelligence is gathered
- Accessing internet company data
- Tapping fibre optic cables
- Eavesdropping on phones
- Targeted spying
Mr Snowden set out his position in a letter, which Hans-Christian Stroebele showed to reporters at a news conference in Berlin on Friday.