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Reverse Nullification And Executive Discretion, Michael T. Morley

Scholarly Publications

The President has broad discretion to refrain from enforcing many civil and criminal laws, either in general or under certain circumstances. The Supreme Court has not only affirmed the constitutionality of such under-enforcement, but extolled its virtues. Most recently, in Arizona v. United States, it deployed the judicially created doctrines of obstacle and field preemption to invalidate state restrictions on illegal immigrants that mirrored federal law, in large part to ensure that states do not undermine the effects of the President’s decision to refrain from fully enforcing federal immigration provisions.

Such a broad application of obstacle and field preemption is …