Title 28 › Part PART VI— - PARTICULAR PROCEEDINGS › Chapter CHAPTER 161— - UNITED STATES AS PARTY GENERALLY › § 2403
When a federal court case raises a question about whether a federal law is constitutional and the United States is not already a party, the court must tell the U.S. Attorney General. The court must let the United States join the case to offer evidence (if that evidence would be allowed) and to argue the constitutional issue. The United States gets the same party rights and the same cost responsibilities as needed, as allowed by law. When a federal court case raises a question about whether a state law is constitutional and the state is not already a party, the court must tell the state’s attorney general and let the state join to present evidence and argue. The state gets the same party rights and cost responsibilities as needed, as allowed by law.
Full Legal Text
Judiciary and Judicial Procedure — Source: USLM XML via OLRC
Legislative History
Reference
Citation
28 U.S.C. § 2403
Title 28 — Judiciary and Judicial Procedure
Last Updated
Apr 6, 2026
Release point: 119-73