It is a central premise of modern American immigration law that immigrants, by virtue of their non-citizenship, are properly subject to an extra-constitutional regulatory authority that is inherent in national sovereignty and buffered against judicial review. The Supreme Court first posited this constitutionally exceptional authority, which is commonly known as the “plenary power doctrine,” in the 1889 Chinese Exclusion Case. There, the Court reconstructed the federal immigration power from a form of commercial regulation rooted in Congress’s commerce power, to an instrument of national self-defense against invading hordes of economically and racially degraded foreigners. Today, generations after the United States abandoned overtly racist i...