The scheme was foiled and both were sent to prison.
The two men had been involved in insurgent attacks in Iraq before arriving in Bowling Green, KY, in 2009 as part of a U.S. program to help displaced Iraqis. Their plan unraveled when they teamed up with an FBI informant, leading to their 2011 arrest.
GOP presidential candidate Sen. Rand Paul pointed to the case in his bid to block plans to bring more Syrian refugees to the U.S.