President Barack Obama listens as Homeland Security Secretary Janet Napolitano delivers the oath of allegiance during a naturalization ceremony for active duty service members and civilians, Monday, March 25, 2013, in the East Room of the White House in Washington. At right is Alejandro Mayorkas, director of United States Citizenship and Immigration Services (USCIS). (AP Photo/Susan Walsh)

Associated Press
President Barack Obama listens as Homeland Security Secretary Janet Napolitano delivers the oath of allegiance during a naturalization ceremony for active duty service members and civilians, Monday, March 25, 2013, in the East Room of the White House in Washington. At right is Alejandro Mayorkas, director of United States Citizenship and Immigration Services (USCIS). (AP Photo/Susan Walsh)
President Barack Obama listens as Homeland Security Secretary Janet Napolitano delivers the oath of allegiance during a naturalization ceremony for active duty service members and civilians, Monday, March 25, 2013, in the East Room of the White House in Washington. At right is Alejandro Mayorkas, director of United States Citizenship and Immigration Services (USCIS). (AP Photo/Susan Walsh)
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