Edward Snowden, 30, said that the 100-year-old law under which he has been charged “forbids a public interest defense”.
“There’s no way I can come home and make my case to a jury,” he said.
Edward Snowden has temporary asylum in Russia after leaking details of NSA electronic surveillance programmes.
He said that his predicament over not having a fair trial was “especially frustrating”.
“Returning to the US, I think, is the best resolution for the government, the public, and myself, but it’s unfortunately not possible in the face of current whistleblower protection laws, which, through a failure in law, did not cover national security contractors like myself,” he told the Free Snowden website.
“Maybe when Congress comes together to end the programs… They’ll reform the Whistleblower Protection Act, and we’ll see a mechanism for all Americans, no matter who they work for, to get a fair trial.”
In December Edward Snowden delivered an “alternative” Christmas message to Britain’s Channel 4 TV, in which he called for an end to mass surveillance.
Earlier on Thursday an independent US privacy watchdog ruled that the bulk collection of phone call data by US intelligence agencies is illegal and has had only “minimal” benefits in preventing terrorism.
The Privacy and Civil Liberties Oversight Board (PCLOB) advised by a 3-2 majority that the program should end.
The report from the PCLOB is the latest of several reviews of the NSA’s mass surveillance program, the details of which caused widespread anger after they were leaked by Edward Snowden.
In a separate development on Thursday, Attorney General Eric Holder told MSNBC television that he was unlikely to consider clemency for Edward Snowden.
Eric Holder said that the US authorities “would engage in conversation” about a resolution of the case if Edward Snowden accepted responsibility for leaking government secrets.
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