Federal Judge Halts Arizona's Criminal Case Against Kalshi — What the CFTC's TRO Means for Prediction Markets

On April 10, 2026, a federal judge issued a temporary restraining order (TRO) blocking Arizona from pursuing criminal charges against Kalshi — the first time a federal court has directly halted a state criminal prosecution of a CFTC-regulated prediction market operator. The ruling came at the request of the Commodity Futures Trading Commission and the U.S. Department of Justice, marking a historic escalation in the national fight over whether prediction markets are federally regulated financial instruments or illegal gambling operations subject to state law.

Here's what happened, why it matters, and what comes next.

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Arizona Was the First State to File Criminal Charges Against a Prediction Market

On March 17, 2026, Arizona Attorney General Kris Mayes filed 20 criminal misdemeanor charges against KalshiEx LLC and Kalshi Trading LLC — the two legal entities that operate the Kalshi prediction market platform.

The charges included:

• 16 counts of operating an unlicensed gambling business in Arizona
• 4 counts of election wagering, covering bets on the 2028 presidential race, the 2026 Arizona gubernatorial race, the 2026 Arizona Republican gubernatorial primary, and the 2026 Arizona Secretary of State race

"Kalshi may brand itself as a 'prediction market,' but what it's actually doing is running an illegal gambling operation and taking bets on Arizona elections, both of which violate Arizona law," AG Mayes said in her office's press release. "No company gets to decide for itself which laws to follow."

Arizona became the first state in the country to pursue criminal — not just civil or regulatory — charges against a prediction market operator. That was a deliberate escalation. Previous state enforcement actions had taken the form of cease-and-desist letters, regulatory orders, and civil lawsuits. Criminal misdemeanor charges were a different level of pressure entirely.

Kalshi had actually preemptively sued Arizona on March 12 — five days before the criminal filing — arguing that federal law gives the CFTC exclusive authority over its contracts and preempts state gambling law. That federal lawsuit temporarily stalled while the criminal case moved forward, with a criminal arraignment scheduled for Monday, April 13.

Then the federal government stepped in.

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The CFTC Filed Suits Against Three States — and Asked for Emergency Relief in Arizona

On April 2 and April 9, 2026, the Commodity Futures Trading Commission — acting alongside the U.S. Department of Justice — filed a series of complaints against Arizona, Connecticut, and Illinois. Each complaint sought declaratory judgments that the Commodity Exchange Act (CEA) grants the CFTC "exclusive authority" to regulate event contracts and that state laws purporting to regulate or ban CFTC-licensed prediction markets are preempted under federal law.

But Arizona was different. Arizona wasn't just sending cease-and-desist letters — it had filed criminal charges. So on April 9, the CFTC filed a motion for a temporary restraining order and preliminary injunction specifically asking the District of Arizona to halt Arizona's criminal prosecution immediately.

"The CFTC is committed to vigorously defending its exclusive authority over prediction markets," CFTC Chairman Michael S. Selig said in an April 9 statement. "We are asking the court to send a clear message that intimidation is not an acceptable tactic to circumvent federal law."

One day later, the court agreed.

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Judge Liburdi Granted the TRO on April 10, Canceling Monday's Arraignment

U.S. District Judge Michael Liburdi issued the TRO on April 10, 2026. His ruling:

• Blocked Arizona from enforcing its gambling laws "in any criminal or civil enforcement actions" against contracts listed on CFTC-regulated designated contract markets
• Called off Monday's arraignment, which had been scheduled for April 13
• Found that the CFTC had demonstrated a reasonable chance of success on the underlying preemption argument

The judge's order cited two key legal findings:

First, that the CFTC had "sufficiently shown that 'event contracts' fall within the Commodity Exchange Act's definition of 'swaps.'" Under federal law, swaps traded on CFTC-licensed designated contract markets (DCMs) are exclusively under federal jurisdiction. If Kalshi's contracts are swaps, Arizona's gambling laws simply cannot reach them.

Second, the judge found that "the Act grants the CFTC 'exclusive jurisdiction' over the regulation of 'swaps'" traded on DCMs — and that Arizona proceeding with a state criminal action could violate the Supremacy Clause of the U.S. Constitution.

This was significant for an additional reason: Judge Liburdi had previously denied Kalshi's own motion to bar the state from proceeding with criminal charges, saying it was too early for him to rule on the preemption issue when Kalshi filed that request. The CFTC's direct intervention — filing its own separate lawsuit and TRO motion — gave the court a different posture and a cleaner basis to act.

"The court's order today sends a clear message that intimidation is not an acceptable tactic to circumvent federal law," CFTC Chairman Selig said after the TRO was granted.

Arizona's AG office said it would "evaluate our next steps."

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What Is a Temporary Restraining Order — and What Doesn't It Decide?

A TRO is an emergency judicial brake, not a final ruling. It freezes the challenged action — here, Arizona's criminal prosecution — while the court determines whether a longer preliminary injunction is warranted. A TRO does not answer the underlying legal question; it simply preserves the status quo while the court takes a closer look.

What the TRO did decide:

• The CFTC has made a colorable showing that Arizona's gambling laws are likely preempted by the CEA
• The harm of allowing Arizona to continue with criminal prosecution — while the federal preemption issue is actively being litigated — justifies emergency relief

What the TRO did not decide:

• Whether prediction markets are definitively swaps under federal law
• Whether the CEA permanently preempts all state gambling laws as applied to CFTC-licensed markets
• Whether Arizona's criminal charges will ultimately be dismissed

The TRO is a bridge, not a destination. A preliminary injunction hearing will determine whether the freeze extends further, and the full litigation over CFTC preemption will continue in parallel.

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The Broader Legal Landscape: A Circuit Split Is Building

The Arizona ruling doesn't exist in isolation. Courts across the country have been reaching sharply different conclusions about whether prediction markets are federally protected:

Wins for CFTC/Kalshi:

• Tennessee (Feb 19, 2026): U.S. District Judge Aleta A. Trauger granted Kalshi a preliminary injunction, ruling that sports event contracts are likely swaps under federal law and that the CEA preempts Tennessee gaming law.
• Third Circuit (April 6, 2026): In the New Jersey case, the Third Circuit Court of Appeals ruled 2-1 that CFTC has exclusive jurisdiction over Kalshi's sports event contracts. This sets binding appellate precedent in New Jersey, Pennsylvania, and Delaware.
• Arizona TRO (April 10, 2026): The CFTC's direct intervention produced the first emergency halt to a state criminal prosecution.

Losses for CFTC/Kalshi:

• Nevada: A Nevada state court judge granted the Nevada Gaming Control Board's temporary restraining order in March 2026, blocking Kalshi from offering sports, election, and entertainment contracts in Nevada. The Ninth Circuit declined to stay that order.
• Ohio (March 9, 2026): A federal court denied Kalshi's motion for a preliminary injunction, finding that sports event contracts in Ohio were not swaps and that federal law did not preempt Ohio gaming law. Kalshi plans to appeal.
• Massachusetts: A Massachusetts state court rejected Kalshi's preemption argument as "overly broad."

The result is a genuine circuit split — a situation where federal appeals courts in different circuits are reaching opposite conclusions on the same question. The Third Circuit (East Coast) sided with federal preemption. Ohio and Nevada courts have sided with state authority. The Ninth Circuit, which covers Nevada and many western states, will hold oral arguments in a consolidated case on April 16, making it the next major milestone to watch.

When federal circuits split on a question of federal law, the U.S. Supreme Court typically steps in. Legal observers across the industry have noted this dispute is rapidly becoming a prime candidate for Supreme Court review.

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What This Means for Prediction Market Users

If you're currently trading on Kalshi, the immediate practical implication is that the platform remains operational nationwide — including in Arizona — at least while the TRO and broader litigation proceed.

Here's what to understand about your position as a user:

Your trades are not in legal jeopardy. The legal dispute is between state regulators and the platform, not between users and anyone. No user faces criminal exposure for trading on a CFTC-licensed DCM.

State availability can still change. Nevada is the clearest example: Kalshi was blocked there by a state court order in March 2026, not a federal one. The TRO in Arizona prevents criminal enforcement under Arizona law but does not address every possible avenue a state might use. If a state court issues an injunction against the platform rather than criminal charges, the CFTC's TRO argument doesn't automatically transfer.

Watch the April 16 Ninth Circuit hearing. Oral arguments before the Ninth Circuit will address the Nevada-related consolidated case. If the Ninth Circuit sides with state authority — confirming the Nevada outcome — that creates a hard split with the Third Circuit's April 6 ruling, dramatically increasing the odds of Supreme Court review.

A federal framework would mean uniform rules. If the CFTC ultimately prevails, users would have consistent, CFTC-governed disclosures, fee rules, and dispute resolution mechanisms regardless of which state they trade from — the same regulatory experience whether you're in Arizona, New Jersey, or Tennessee. If states prevail, the landscape looks more like sports betting: patchwork access, with some states permitting broad prediction market access and others blocking it.

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Frequently Asked Questions

Is Kalshi legal to use right now? Yes. Kalshi is a CFTC-licensed designated contract market and derivatives clearing organization — the most comprehensive federal approval available to a prediction market in the United States. Individual users trading on the platform are not the target of any state enforcement action. The litigation is between Kalshi (and the CFTC) and state regulators.

What did Arizona actually charge Kalshi with? Arizona AG Kris Mayes filed 20 criminal misdemeanor counts against KalshiEx LLC and Kalshi Trading LLC on March 17, 2026. The charges include 16 counts of operating an unlicensed gambling business and 4 counts of election wagering — covering bets on the 2028 presidential race and three 2026 Arizona state races.

What does the CFTC's TRO actually block? The TRO bars Arizona from enforcing its gambling laws "in any criminal or civil enforcement actions" against contracts listed on CFTC-regulated designated contract markets. The Monday, April 13 arraignment was specifically called off as a result.

Will Arizona appeal? Arizona's AG office said it "disagrees with the court's ruling and will evaluate our next steps." An appeal of a TRO is difficult and rarely successful, but Arizona could challenge a preliminary injunction if and when one is issued. The state could also narrow its enforcement theory or pursue other legal avenues.

What's the core legal question? Whether Kalshi's event contracts are "swaps" under the Commodity Exchange Act — and if so, whether the CEA's grant of exclusive CFTC jurisdiction preempts state gambling laws. The CFTC says yes and yes. States like Arizona, Nevada, and Ohio say the CEA doesn't extend that far, especially for contracts that look like sports betting.

Is this heading to the Supreme Court? The Third Circuit has ruled for federal preemption. Ohio and Nevada courts have ruled against. The Ninth Circuit will hear oral arguments on April 16. If the Ninth Circuit reaches the opposite conclusion from the Third Circuit, a Supreme Court petition becomes highly likely within the next year or two.

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What's Next: Key Dates to Watch

• April 13: Arizona was supposed to hold Kalshi's criminal arraignment. That hearing has been called off under the TRO.
• April 16: The Ninth Circuit holds oral arguments in the consolidated Nevada-related case. This is the next major appellate event.
• April 24: The TRO's current expiration window. Judge Liburdi could extend it with a preliminary injunction if the CFTC demonstrates it on the merits.
• Ongoing: CFTC complaints against Connecticut and Illinois proceed in parallel, with similar preemption arguments.

The prediction market industry is at a defining legal inflection point. Arizona's criminal charges and the CFTC's federal TRO response have elevated a regulatory dispute into a constitutional question about which level of government gets to define the line between financial instruments and gambling. The outcome will shape whether prediction markets in the United States operate under a single federal rulebook or a fifty-state patchwork for years to come.

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Sources & Verification

• CFTC Press Release 9211-26 (April 10, 2026) — TRO granted: CFTC.gov — verified April 12, 2026
• CFTC Press Release 9208-26 (April 9, 2026) — TRO/PI motion filed: CFTC.gov — verified April 12, 2026
• Arizona AG Press Release (March 17, 2026) — criminal charges: azag.gov — verified April 12, 2026
• Associated Press (April 10/11, 2026) — Judge Liburdi ruling, order language, Arizona response: AP News — verified April 12, 2026
• Reuters (April 6, 2026) — Third Circuit ruling: Reuters — verified April 12, 2026