Article Photos: Must voters have to prove citizenship to register? 3/4

FILE – This Aug. 5, 2008, file photo shows the U.S. Citizenship and Immigration Services building Phoenix. The Supreme Court argued Monday, March 18, 2013 over whether states fighting voter fraud and illegal immigration can make people document their U.S. citizenship before allowing them to use a federal voter registration system that was designed to make it easier to vote.  (AP Photo/Matt York, File)