Ecuador's foreign minister says Edward Snowden is seeking asylum in that country.
Snowden has been on the move with help of WikiLeaks.
The anti-secrecy website says Snowden touched down in Moscow Sunday after leaving Hong Kong, and confirms that he plans to head to Ecuador.
His travel plans are facing a potential obstacle, however, as a government official told the Associated Press that Snowden's passport has been revoked.
He had been in hiding in Hong Kong for weeks after admitting he leaked information about NSA surveillance programs.
The U.S. had contacted leaders there to try to get Snowden extradited to face espionage charges, but Hong Kong officials said there was no basis to stop him from leaving.
Politicians are now debating how the U.S. should deal with Snowden.
"I want to get him caught and brought back for trial, and I think we need to know exactly what he has," Democratic Sen. Dianne Feinstein of California said on CBS' "Face the Nation".
"If he cozies up to the Russian government, it will be nothing but bad for his name in history," Republican Sen. Rand Paul of Kentucky said on CNN's "State of the Union." "If he goes to an independent third country like Iceland and he refuses to talk to any sort of formal government about this, I think there's a chance that he'll be seen as an advocate of privacy."
The head of the NSA, General Keith Alexander, told ABC's "This Week" that Snowden betrayed the trust placed in him, and that he has not acted with "noble intent."