United States v. state
United States v. State of Arizona
U.S. District Court for the District of Arizona, 2:26-cv-02246
Injunction granted
Consolidated into KalshiEX v. Johnson (2:26-cv-01715); PI granted May 5, 2026. Arizona's appeal (9th Cir. 26-4281) was stayed pending the Nevada appeals; after the Aug. 28, 2026 Nevada ruling, Arizona asked on Sept. 14, 2026 for summary vacatur of the PI as to sports contracts. No ruling found as of Oct. 21, 2026; the PI remains in effect.
The question
Whether the CEA preempts Arizona law as applied to event contracts on CFTC-registered exchanges, so that the state may be enjoined from enforcing it against them.
The federal government sued Arizona as the state pursued civil and criminal enforcement against CFTC-regulated exchanges. It won a TRO and then the first federal-government preliminary injunction in this litigation.
Docket timeline
Arizona asks the Ninth Circuit to summarily vacate the PI as to sports contracts.
Source: defirate.com
Arizona's appeal docketed (No. 26-4281).
Source: dockets.justia.com
Preliminary injunction granted.
Source: dockets.justia.com
TRO granted.
Source: cftc.gov
Complaint filed (one of three suits filed that day).
Source: cftc.gov
Consolidated into No. 2:26-cv-01715.
Source: dockets.justia.com
Sources
- Justia docket: United States v. Arizona, D. Ariz. 2:26-cv-02246
- Justia docket: KalshiEX v. Johnson, D. Ariz. 2:26-cv-01715
- CFTC release 9206-26: CFTC sues Arizona, Connecticut, Illinois (2026-04-02)
- CFTC release 9208-26: CFTC seeks to enjoin Arizona enforcement (2026-04-09)
- CFTC release 9211-26: TRO blocks Arizona criminal enforcement (2026-04-10)
- Arizona Mirror: criminal case against Kalshi blocked by federal judge (2026-05-05)
- Justia docket: CFTC v. Johnson, 9th Cir. 26-4281
- DeFi Rate prediction market lawsuit tracker (updated 2026-10-20)