526 U.S. 415 (U.S. Supreme Court 1999)
INS v. Aguirre-Aguirre is a cornerstone immigration and administrative law decision clarifying that federal courts owe Chevron deference to the Board of Immigration Appeals (BIA) when it interprets ambiguous provisions of the Immigration and Nationality Act (INA).
Do federal courts owe Chevron deference to the BIA's interpretation and application of the INA's 'serious nonpolitical crime' bar to withholding of deportation, and must the BIA consider broader humanitarian and country-conditions factors—such as the persecuting government's conduct—when determining whether that bar applies?
When the Attorney General (acting through the BIA) reasonably interprets ambiguous provisions of the INA, reviewing courts must defer under Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc. The 'serious nonpolitical crime' bar to withholding focuses on the alien's conduct: adjudicators balance the political character of the offense against its criminal nature, with particular weight on violence against persons, the severity of harm, and whether acts are disproportionate to the alleged political objective. International materials such as the UNHCR Handbook may be informative but are not binding. Courts may not substitute their judgment for the BIA's on matters committed to agency discretion and expertise; if new considerations arise, the appropriate course is to remand to the agency.
Yes. The BIA's interpretation of the INA's 'serious nonpolitical crime' bar is entitled to Chevron deference, and the Ninth Circuit erred by substituting its own balancing approach and by requiring consideration of broader humanitarian and country-conditions factors not compelled by the statute. The Supreme Court reversed and remanded.
Aguirre-Aguirre is a leading case on Chevron deference in immigration law. It solidifies the BIA's interpretive primacy over ambiguous INA terms and instructs courts not to graft extra-statutory humanitarian or foreign-policy considerations onto statutory bars to relief. Substantively, it clarifies the serious nonpolitical crime analysis, emphasizing proportionality and the gravity of harm—especially violence against persons—over generalized country-condition critiques. For students, the case illustrates the intersection of immigration adjudication with administrative law, the limits of judicial review, and how international soft-law sources (like the UNHCR Handbook) may inform but do not control U.S. statutory interpretation. It remains central to cases involving politically motivated violence and the withholding/asylum bars.