US buys Iranian oil for troops in Afghanistan. (VIDEO)

A new report out this month found that American officials could have been unknowingly buying fuel from Iran for years - despite numerous sanctions strictly prohibiting such a purchase. The report found that the US failed to verify the source of the fuel they purchased for Afghan security forces due to a lack of oversight by the Department of Defense. Between 2007 and 2012, about 1.1 billion dollars was spent for these purposes. So how did this happen? And what does it say about US sanctions in Iran? Jamal Abdi, Policy Director for the National Iranian American Council joins us to break it down.