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United States Leading Case grounds illegality

Kisor v Wilkie

588 U.S. 558 (2019)
JurisdictionUnited States
CourtUS Supreme Court
Year2019
StatusBinding authority

Summary

Auer deference to agency interpretation of ambiguous regulations survives but is narrowed; courts must exhaust all interpretive tools before finding genuine ambiguity.

Key Principle

Auer deference survives but is significantly narrowed; courts must first exhaust all tools of interpretation before concluding a regulation is genuinely ambiguous.

Area of Law

public-law

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