Adjustment of Immigrant Status is the procedure allowing foreign nationals already in the U.S. to apply for immigrant status. Foreign national admitted to the U.S. under the category of nonimmigrant, refugee, or parolee, can apply to get their status changed to that of lawful permanent resident if they are eligible to receive an immigrant visa and one is immediately available. Eligible persons can apply for immigrant status with the U.S. Citizenship and Immigration Services. An alien will be considered an immigrant as of the date of adjustment, even though the alien may have been in the U.S. for a longer period of time.