[caption id="attachment_113930" align="alignright" width="226"] Greek shipowner Victor Restis (C) leaves a court in Athens July 23, 2013.CREDIT: REUTERS/JOHN KOLESIDIS[/caption] (Reuters) - The U.S. government is considering using a powerful national security law to halt a private lawsuit against a non-profit group, United Against A NuclearIran, according ...