The Immigration and Nationality Act (the Act) provides U.S. citizens, permanent residents, asylum seekers, and refugees protection against employment discrimination based on their immigration status. The Act applies if an employer has more than four employees.
Discrimination under the Act occurs when an employer treats a person differently based on their immigration or citizenship status. The law requires Texas employers treat people equally when they announce a position, solicit applications, conduct interviews, make job offers, hire an individual, or terminate employment. Moreover, employers cannot retaliate against an employee if they file a claim of discrimination, participate in an investigation, or assert their rights under any anti-discrimination law. However, this rule does not apply to permanent residents who fail to file for naturalization within six months of eligibility.
If a prospective or current employee suffers any type of adverse employment action based on their immigration status, their employer may face liability. Some common forms of discrimination based on immigration status are when an employer only hires U.S. citizens, if an employer does not want to hire a person because of the paperwork involved in hiring a temporary resident, or demanding to see specific un-required documents.
Dallas Employment Lawyer Blog

