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
CLINIC v. Rubio
This lawsuit challenges the Trump administration’s sweeping suspension of immigrant visa processing for people from 75 countries.
Last update: Oct 1, 2026
CLINIC v. Rubio: The 75-Country Visa Pause Was Vacated. What Happens Now?
Published Sep 30, 2026 A practical roadmap, created by CLINIC, for immigrant visa applicants and their legal representatives.
LGML v. Noem
This lawsuit seeks to stop the Trump administration from unlawfully expelling hundreds of unaccompanied Guatemalan children from the United States.
Last update: Sep 21, 2026
How Anti-Black Racism Shapes Welfare Inequality for Immigrants
Published Sep 18, 2026 Laws and policies throughout American history have consistently and systematically ensured that Black people and immigrants do not receive equal opportunities to escape poverty.
Nicholas Espíritu
NILC Deputy Legal Director