The United States\u27 Supreme Court has never upheld a claim of estoppel against the government. A citizen relying on the government\u27s advice does that at her peril: if the government wrongfully misrepresents or misinterprets a statute it can (and by some interpretations, must) go back on its word leaving the aggrieved citizen with no recourse. The Supreme Court has provided many arguments for this position, but the core of its rationale is premised on protecting what Europeans refer to as the principle of legality. The principle of legality states that the Executive cannot waive requirements from primary legislation or deviate from statutes, even to protect an individual\u27s reliance. This article demonstrates how similar concerns af...