The USCIS is responsible for the administration of immigration and naturalization adjudication functions and establishing immigration services policies and priorities. These functions include: adjudication of immigrant visa petitions; adjudication of naturalization petitions; adjudication of asylum and refugee applications; adjudications performed at the Service Centers, and all other adjudications performed by USCIS.

Processes applications and petitions of aliens to permit them to become non-immigrant students and workers, permanent residents and U.S. citizens, and to bring families into the U.S.

Provides decisions on which refugees fearing prosecution in their country of origin may remain in the United States.