FILE - This undated file photo released by his family via FreeAmir.org shows Amir Hekmati. Hekmati, a former U.S. Marine being held in Iran over the past two years on accusations of spying for the CIA. An interim nuclear agreement between world powers and Iran presents "the perfect time" to press for the release of Hekmati being held on spying charges, a former defense secretary and three retired high-ranking generals wrote to President Barack Obama. The letter, dated Monday, Jan. 20, 2014 calls on the White House to take "immediate action to facilitate the release" of Hekmati. (AP Photo/Hekmati family via FreeAmir.org, File)