Citizenship or immigration status discrimination with respect to hiring, firing, and recruitment or referral for a fee, by employers with four or more employees, subject to certain exceptions. Employers may not treat individuals differently because they are, or are not, U.S. citizens or work authorized individuals. U. S. citizens, recent permanent residents, temporary residents, asylees, and refugees are protected from citizenship status discrimination. Exceptions: permanent residents who do not apply for naturalization within six months of eligibility are not protected from citizenship status discrimination. Citizenship status discrimination which is otherwise required to comply with law, regulation, executive order, or government contract is permissible by law.