David Petraeus: Iran more of a threat than ISIL - Nick Gass - POLITICO
Marine Gen. James Mattis: Iran is No. 1 threat in Middle East - Washington Times
Panetta: Iranian Threat Spreads - WSJ
Romney: Nuclear Iran is 'number one national security threat' – CNN Security Clearance - CNN.com Blogs
They have been the number one sponsor of terrorism since 2009.
Iran number one state sponsor terrorism | Video | C-SPAN.org