Denaturalize them for fraud in the application, and deport them. What has the government done with those it finds lied on their citizenship applications? Shrug it off as "need more money for fingerprint database"?
Just found a thread on it.
More than 800 immigrants mistakenly granted citizenship (pending deportation orders)
http://www.freerepublic.com/focus/f-news/3471006/posts
From the thread:
“DHS officials identified an additional 953 people who had been naturalized despite outstanding deportation orders, though auditors couldn’t determine if those immigrants had digital fingerprints on file or not.
Roth’s report said fingerprints are missing from federal databases for as many as 315,000 immigrants with final deportation orders or who are fugitive criminals. Immigration and Customs Enforcement has not reviewed about 148,000 of those immigrants’ files to add fingerprints to the digital record.
The gap was created because older, paper records were never added to fingerprint databases created by both the now-defunct Immigration and Naturalization Service and the FBI in the 1990s. ICE, the DHS”