Update: In June 2024, the Court temporarily blocked HB 4156, which was set to take effect on July 1. It is now on hold as the case is litigated. NILC’s lawsuit has been consolidated with the federal government’s challenge to HB 4156 in United States v. State of Oklahoma.
Case Overview
In May 2024, the National Immigration Law Center and co-counsels filed a lawsuit, challenging Oklahoma’s law, HB 4156, as unconstitutional. In this case, we represent the Oklahoma-based organization Padres Unidos, and an individual plaintiff who came to the United States nearly 20 years ago as a 1-year-old.
HB 4156 conflicts with existing immigration laws by usurping federal control over the immigration system, regulating people’s entry into the United States, and banishing people from Oklahoma who have a federal right to remain here. Under HB 4156, entire categories of immigrants would be barred from entering the state, or could be ordered to leave, even if they are pursuing asylum or other lawful immigration status.
In this case, our plaintiff has lived in Oklahoma her whole life and her entire family — including her parents, grandparents, aunts, uncles, cousins, and U.S.-citizen siblings — all live nearby. She could be prosecuted and removed from Oklahoma under this new law and separated from her entire family and the only place she has called home.
HB 4156 is based largely on S.B. 4, the Texas immigration law that NILC has also challenged in a separate case.
Legal Documents
How States Are Fighting Back Against Trump’s Mass Deportation Machine
Published Jul 9, 2026 This report captures pro-immigrant state laws enacted in 2025 and bills signed in the first five months of 2026 to address immigration enforcement.
Green Card Holders: Know Your Rights & Risks During the Second Trump Administration
Updated Jul 8, 2026 This guide helps Green Card Holders understand the law, their rights, and how to lower risk and make a safety plan.
Community Alert: Immigration Arrests at Airports
Updated Jul 8, 2026 This resource provides travel safety tips and other resources for immigrants traveling through U.S. airports.
Immigration Relief Legislation – Table
Published Jul 8, 2026 The tables below include new immigration relief options in proposed legislation primarily introduced in the 119th Congress. These tables only address and compare the legalization provisions in each bill; please note that most of these bills...
Nicholas Espíritu
NILC Deputy Legal Director