Deceased Boston bombing suspect Tamerlan Tsarnaev had his U.S. citizenship application delayed because of a prior FBI interview.
The interview was conducted in 2011 at the request of the Russian government, based on suspicion that Tsarnaev may have had links to terrorist groups, The New York Times reports.
Although Tamerlan's interview succeeded in delaying his citizenship application, that's not the only way such an application can be delayed or denied. Here are five common reasons why even law-abiding immigrants can be denied citizenship:









