Immigration · Primary-source case analysis

Morales-Santana: Citizenship Transmission Rules Cannot Prefer Unwed Mothers

By Aneeta Mishra and Timothy Chan

Published September 13, 2026

Sessions v. Morales-Santana examines citizenship at birth, sex-based classifications, and the remedial choice when extending a statutory exception would conflict with Congress’s design.

The citizenship claim depended on the father’s residence

Luis Morales-Santana was born abroad to an unwed U.S.-citizen father and a noncitizen mother. His father fell twenty days short of the physical-presence period then required of citizen fathers, while a shorter one-year rule applied to citizen mothers.

The sex classification failed heightened scrutiny

The government’s justifications rested on overbroad assumptions about mothers’ and fathers’ relationships to children born abroad. The Court held that those gender-based distinctions could not survive the equal-protection scrutiny applicable to sex classifications.

The Court would not extend the exception

Equal treatment can sometimes be achieved by extending a benefit or withdrawing it. Here the shorter maternal exception departed from Congress’s general physical-presence rule, so the Court applied the longer rule uniformly rather than enlarging the exception judicially.

The individual did not obtain citizenship

Because Morales-Santana’s father did not satisfy the longer rule, the Court affirmed the denial of his citizenship claim despite recognizing the constitutional violation. Congress remained free to enact a new, equal transmission rule.

Key takeaways

• Use the statute in effect at the child’s birth.
• Calculate the citizen parent’s physical presence precisely.
• Identify any sex-based differential and the governing constitutional standard.
• Analyze the remedy separately from the finding of unequal treatment.