Hammar, 27, is charged with illegal possession of a firearm -- an heirloom shotgun that once belonged to his grandfather -- and has spent more than four months in a prison in Matamoros, Mexico.
The saga of Hammar, a veteran of Marine campaigns in Iraq and Afghanistan, has become a pre-Christmas bilateral issue brought up on the floors of the U.S. Senate and the House of Representatives.
For the first time, a photo of Hammar’s detention has been made public.
Read more in this report from McClatchy Newspapers.in Florida are fighting for Hammar's
Also check out this report about how family and friends in Florida are fighting for Hammar's release.