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R48525

Federal Preemption and State Authority to Deter the Presence of Unlawfully Present Aliens: An Overview and Issues for the 119th Congress

Published May 6, 2025Updated Aug 1, 2025

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

Federal Preemption and State Authority to Deter the Presence of Unlawfully Present Aliens:… — Informed