Immigration · Primary-source case analysis

Mendoza-Lopez: A Fundamentally Unreviewed Deportation Order Cannot Automatically Establish Illegal Reentry

By Aneeta Mishra and Timothy Chan

Published August 25, 2026

United States v. Mendoza-Lopez arose from illegal-reentry prosecutions that relied on group deportation proceedings in which the immigration judge accepted waivers the lower courts found invalid.

The prior order supplied an element of the criminal charge

The government relied on the administrative deportation to prove the defendants had previously been removed, giving that proceeding direct criminal consequences.

The hearing defects foreclosed meaningful review

The waivers did not provide a considered relinquishment of appeal, leaving no effective opportunity to obtain judicial examination of the deportation order.

Due process required collateral review

When an administrative process plays a critical role in a later criminal sanction, the order cannot be made unreviewable if the proceeding effectively eliminated judicial review.

Congress later codified specific requirements

Current 8 U.S.C. section 1326(d) and later Supreme Court authority govern collateral attacks, including exhaustion, deprivation of review, and fundamental unfairness. Each element must be addressed.

Key takeaways

• Obtain the full prior removal record and advisals.
• Identify available administrative and judicial review.
• Analyze every current section 1326(d) requirement.
• Connect any procedural defect to prejudice and the criminal charge.