Lawyer proposes deal for Edward Snowden's voluntary return

(CNN) -- A lawyer for the father of Edward J. Snowden has offered federal authorities a deal that he says would likely lead the accused leaker to return voluntarily to the United States to face espionage charges.

The letter, dated Thursday and obtained Friday by CNN's "Amanpour," is addressed to Attorney General Eric Holder and written by Bruce Fein, a Washington-based lawyer for Snowden's father, Lonnie G. Snowden.

It demands that the former National Security Agency computer contractor who exposed details about U.S. surveillance programs remain free prior to trial; not be subject to a gag order; and be tried in a place of his choosing.

It further demands that, if any of those promises is broken, the prosecution would be dismissed.

"With these written representations and guarantee, Mr. Snowden is reasonably confident that his son could be persuaded to surrender voluntarily to the jurisdiction of the United States to face trial," Fein wrote.

Snowden, 30, has been at Moscow's international airport since Sunday, when he arrived from Hong Kong.