1. The Ruling That Stopped Monday's Arraignment
The April 13 arraignment of Kalshi in Maricopa County Superior Court on 20 misdemeanor criminal counts of operating an illegal gambling business in Arizona had been the most acute immediate threat in the escalating legal war between prediction markets and state gambling regulators. Hours before close of business on Friday, April 10, U.S. District Judge Michael Liburdi — the same judge who earlier in the week had denied Kalshi's own motion for a preliminary injunction against the state — issued a temporary restraining order in response to the CFTC's separate motion, blocking Arizona from proceeding with the criminal case.
The restraining order will remain in effect for two weeks, running through April 24. The Arizona Attorney General's Office confirmed it would inform the Maricopa County court on Monday that it would not move forward with the arraignment while the order is in place. CFTC Chairman Michael Selig issued a statement characterizing the ruling in pointed terms: "Arizona's decision to weaponize state criminal law against companies that comply with federal law sets a dangerous precedent. The court's order today sends a clear message that intimidation is not an acceptable tactic to circumvent federal law."
2. The Legal Standard the Judge Applied
Judge Liburdi's written order articulated the legal basis for the temporary restraining order in terms that carry significant weight for the broader federal-state prediction market jurisdictional dispute. The judge found that the CFTC had made "a clear showing that it is likely to succeed on the merits of its claim that Arizona's gambling laws are preempted by the Commodity Exchange Act." The court further found that Arizona proceeding with a state enforcement action might violate the Supremacy Clause of the U.S. Constitution.
These findings are substantive legal conclusions — not procedural accommodations — and they represent a materially favorable statement for the CFTC's broader preemption theory. The "likelihood of success on the merits" standard is one of four factors courts evaluate when granting temporary restraining orders and preliminary injunctions, and it is generally considered the most important. A judge who finds the CFTC is likely to succeed on the merits of its preemption argument is effectively signaling that the legal theory underpinning the federal position — that the Commodity Exchange Act preempts state gambling law as applied to CFTC-regulated event contracts — has genuine legal traction at this court.
The finding is analytically significant given the background: the same judge had denied Kalshi's own preliminary injunction motion two days earlier. The distinction is that the two motions were argued on different grounds, and the CFTC's government authority — combined with the specific Supremacy Clause framing — provided a stronger legal basis for the restraining order than Kalshi's private party arguments had offered.
3. The Twenty Counts Arizona Filed
Arizona's criminal case against Kalshi, the most aggressive state enforcement action against a prediction market operator to date, charged the company with 20 misdemeanor counts of wagering under state law. The charges specifically alleged that Kalshi had operated an illegal gambling business in Arizona without a license and had unlawfully allowed customers to place bets on elections — both of which are prohibited under Arizona's gaming statutes.
The election betting element of the charges is particularly significant. Arizona is among the states that explicitly prohibits wagering on election outcomes, a restriction that predates the current prediction market legal controversy and reflects longstanding state policy concerns about the integrity of democratic processes. Kalshi offers contracts allowing users to bet on the outcomes of elections at various levels, which has been one of the most commercially successful and controversial product categories on the platform.
The company's defense has consistently been that prediction market event contracts are structurally different from gambling — they are bilateral peer-to-peer transactions in which two parties take opposite sides of a financial contract, rather than bets against a house with a structural edge — and that this structural distinction places them within the Commodity Exchange Act's swap framework rather than state gambling law. Judge Liburdi's temporary restraining order, by finding the preemption argument likely to succeed, implicitly lends weight to that structural argument at least for purposes of maintaining the status quo pending fuller legal briefing.
4. The CFTC's Role: Government Authority as the Critical Factor
One of the most strategically significant aspects of Friday's ruling is the specific role the CFTC's lawsuit played in obtaining the restraining order. Kalshi had previously sought and been denied its own preliminary injunction against Arizona's state action. The same judge denied that motion. But when the CFTC — as a federal government agency asserting its exclusive regulatory jurisdiction — filed the motion, the judge granted it.
This distinction reflects a fundamental principle of federal preemption litigation: private parties can assert preemption as a defense, but the government's assertion of exclusive federal authority over a regulated domain carries different — and generally stronger — legal weight. The CFTC's lawsuit against Arizona, Connecticut, and Illinois is not merely supportive of Kalshi's private litigation; it is an independent assertion of federal sovereign authority over a regulatory domain that Congress has defined through the Commodity Exchange Act.
CFTC Chairman Selig has been explicit about the agency's view of its role: the commission has described its jurisdiction over event contracts as "clear and longstanding exclusive jurisdiction" and has characterized state attempts to regulate these products as intrusions on congressional intent. The April 10 ruling validates that framing at the trial court level, at least on the preliminary standard.
5. The Trump Political Context
The Trump administration's decision to have the CFTC and DOJ file lawsuits against Arizona, Connecticut, and Illinois on April 2 — rather than merely filing amicus briefs supporting Kalshi in existing litigation — reflects a specific policy commitment that has political dimensions beyond the regulatory legal dispute. President Trump's eldest son, Donald Trump Jr., is an adviser to both Kalshi and Polymarket and an investor in Polymarket. Trump's social media platform Truth Social is in the process of launching a cryptocurrency-based prediction market called Truth Predict.
These relationships create a meaningful overlap between the Trump administration's policy advocacy for prediction markets as financial instruments under exclusive federal jurisdiction and the Trump family's direct financial interests in the success of the prediction market industry. Critics have noted this overlap as a potential conflict of interest. The administration's response has been to frame its position in terms of the legal merits — the Commodity Exchange Act's preemption of state gambling law — rather than acknowledging the political relationships.
The prediction market issue is unusual in that it creates political alignments that cut across conventional partisan lines: the Trump administration is aggressively expanding federal authority to override state gambling regulation in the name of market innovation, while Democrats and Republicans in state governments have both moved against prediction markets based on consumer protection and democratic integrity concerns.
6. The Split Legal Landscape Before the Ruling
The temporary restraining order comes against a backdrop of mixed judicial outcomes for prediction markets across the country, which reflects the genuinely contested nature of the preemption question. The Third Circuit Court of Appeals ruled earlier in the week that prediction markets are subject to CFTC jurisdiction and that it is within the CFTC's discretion whether to allow or restrict sports-related products — a ruling favorable to the federal preemption theory. That ruling, combined with the Arizona restraining order, represents two favorable federal court outcomes in the same week.
On the state side, federal and state courts in Nevada and Massachusetts had previously issued rulings allowing those states' actions against Kalshi to proceed. Federal judges in New Jersey and Tennessee had ruled in Kalshi's favor. Prior to the Friday ruling, states had won 14 of 16 preliminary procedural motions in various state courts. The Ninth Circuit has scheduled a hearing on a consolidated case that will allow multiple parties — exchanges, states, and the CFTC — to argue the preemption question before one of the most influential federal appeals courts in the country.
7. What the Two-Week Order Does and Does Not Do
The temporary restraining order issued by Judge Liburdi does specific and limited things. It blocks Arizona from proceeding with the criminal case against Kalshi — meaning the April 13 arraignment is canceled, and Arizona cannot take any further state enforcement action against Kalshi under state gambling laws — for a period of two weeks ending April 24. It does not permanently resolve the jurisdictional question or make a final determination about whether the Commodity Exchange Act preempts Arizona's gambling laws as applied to event contracts.
Within the two-week window, the parties will brief the CFTC's motion for a preliminary injunction, which would extend the relief for a longer period pending full merits litigation. If the preliminary injunction is granted, Arizona would be blocked from continuing its criminal case while the federal lawsuit proceeds through the courts. If the preliminary injunction is denied, Arizona could potentially revive the criminal proceedings and reschedule the arraignment.
The Arizona Attorney General's Office stated it disagreed with the ruling and would evaluate next steps — language that preserves the state's ability to contest the preliminary injunction aggressively and to appeal any adverse ruling to the Ninth Circuit. The same court that will hear the consolidated Ninth Circuit case involving Kalshi, Robinhood, and other prediction market operators would ultimately hear any appeal of the Arizona district court's decision, making the Ninth Circuit oral argument scheduled for next week particularly important for the trajectory of the case.
8. Implications for the Other State Actions
The Arizona temporary restraining order is directly applicable only to Arizona's enforcement against Kalshi. But its legal reasoning — specifically the finding that the CFTC's preemption argument is likely to succeed on the merits — has persuasive value in the parallel proceedings in Connecticut, Illinois, and other states where the CFTC has filed separate lawsuits and where similar motions may be filed. Courts in other jurisdictions are not bound by Judge Liburdi's findings, but a well-reasoned district court ruling finding federal preemption likely is a data point that other judges will consider when evaluating similar motions.
The Connecticut and Illinois proceedings are at an earlier stage, as neither state had reached the point of criminal charges or imminent arraignment dates when the CFTC filed its lawsuits. The Arizona ruling may accelerate the Connecticut and Illinois courts' consideration of temporary relief, particularly if the CFTC files similar restraining order motions in those cases.
9. Kalshi's Response and Market Position
Kalshi's head of enforcement characterized the ruling as "a step in the right direction." The company's position throughout the Arizona dispute has been that the criminal charges were filed specifically to interfere with its private civil lawsuit against the state, creating a strategic use of criminal process to deter federal litigation that Kalshi finds particularly objectionable. The federal judge's finding that the preemption argument is likely to succeed validates that the company's substantive legal position — that it operates under federal jurisdiction, not state gambling law — has merit.
The ruling comes as Kalshi's market share has grown to approximately 89% of the U.S. prediction market according to concurrent industry data, a concentration that reflects the network effects that accrue to the most liquid and trusted platform in a young market category. Maintaining Nasdaq listing and operational continuity across all U.S. states is a commercial necessity for sustaining that market share, and the Arizona ruling removes the most immediate threat to operational continuity that the company has faced in the current wave of state enforcement activity.
10. The Path to Supreme Court
Multiple legal observers have characterized the prediction market jurisdictional dispute as one that is likely to reach the U.S. Supreme Court regardless of how the current round of district and circuit court proceedings resolve. The specific constitutional question — whether the Commodity Exchange Act's preemption of state regulation extends to contracts on sports outcomes that states regulate as gambling — involves a conflict between federal and state regulatory authority in a domain where both have historically asserted jurisdiction. Circuit court splits on the question, which now appear likely given the different outcomes in different circuits, are the most reliable pathway to Supreme Court review.
The Arizona temporary restraining order is one step in that long journey. It does not resolve the underlying question but it does ensure that Kalshi does not face criminal prosecution in the most aggressive state enforcement jurisdiction while the legal process unfolds. For an industry whose commercial viability depends on operating across all fifty states under a unified federal framework — rather than navigating fifty separate state licensing regimes — every day of continued federal legal protection is commercially valuable, and Friday's ruling provided that protection at the most critical moment.