Federal Government Sues Arizona, Connecticut, and Illinois to Protect Prediction Markets — Is the Supreme Court Next?
For the first time ever, the federal government has sued states over prediction markets — and a circuit split could put this fight in front of the Supreme Court.
The legal war over prediction markets escalated dramatically on April 2, 2026, when the Commodity Futures Trading Commission and the Department of Justice filed simultaneous lawsuits against Arizona, Connecticut, and Illinois. It was the first time the federal government had ever taken states to court over prediction markets, and it signals that Washington is done watching from the sidelines. The question now is whether this fight ends at the circuit court level or heads to the Supreme Court.
Why the Federal Government Is Suing Three States
The CFTC’s core argument is straightforward: under the Commodity Exchange Act, the federal commission has exclusive regulatory authority over CFTC-regulated exchanges. When states attempt to apply their own gambling laws to those exchanges, those laws are “unconstitutional and invalid.” CFTC Chair Michael Selig has been direct about the commission’s position, stating it has “exclusive regulatory authority” and will defend against “overzealous state regulators.”
The three defendant states have not been passive. Arizona had already filed 20 criminal misdemeanor charges against Kalshi executives on March 17, 2026 — the first criminal charges ever brought against a prediction market company. Connecticut Attorney General William Tong dismissed the federal lawsuits as “recycled industry arguments.” Illinois Governor Pritzker’s office went further, accusing the platforms of “carrying water for companies driving well-documented and lucrative insider trading schemes.”
The Courts Are Starting to Weigh In
The federal judiciary has already begun shaping this landscape in ways that favor the prediction market platforms. On April 7, 2026, the Third Circuit Court of Appeals ruled 2-1 in favor of Kalshi, becoming the first federal appellate court to weigh in on this question. The majority found that the CFTC does indeed have exclusive jurisdiction under the CEA, and that state gambling laws cannot override federal commodity law when applied to a CFTC-regulated exchange.
That ruling matters — but it is not the final word. The Ninth Circuit is scheduled to hear oral arguments on April 16, 2026, in a case pitting Kalshi, Robinhood promo code, and Crypto.com promo code against Nevada. Nevada already has a court-enforced ban on Kalshi sports, politics, and entertainment contracts. If the Ninth Circuit sides with Nevada and the states, that creates a direct circuit split with the Third Circuit’s decision, and a Supreme Court petition becomes not just likely but essentially inevitable.
The Political Backdrop Cannot Be Ignored
The Trump administration’s posture on prediction markets is worth understanding in full context. The CFTC under the previous administration dropped its original appeal against Kalshi in May 2025, a move that cleared the way for prediction markets to expand. Donald Trump Jr. is a strategic advisor to both Kalshi and Polymarket, two of the largest prediction market platforms. Whether or not those relationships directly influenced the CFTC’s decision to escalate to suing three states is a question that partisans on both sides are arguing about, but the policy trajectory is clear: the current federal posture strongly favors platform expansion over state restriction.
What This Means for Bettors Right Now
For anyone trying to use these platforms today, the practical reality is a patchwork of access that changes depending on your zip code. Nevada users have already lost access to Kalshi’s core sports, politics, and entertainment contracts following the court-enforced ban. In Massachusetts, state-level restrictions were temporarily stayed by an appeals court, meaning access is currently available but legally uncertain. In Arizona, Connecticut, and Illinois, the new federal lawsuits throw the regulatory picture into flux.
The legal status of prediction markets is arguably the most fragmented of any financial or gaming product operating nationally right now. A user in one state has full access; a user in a neighboring state may have none. That geographic lottery is a direct product of the litigation wave, and it will not stabilize until the Supreme Court or Congress provides a definitive answer on federal preemption.
Legal experts across the spectrum agree that a SCOTUS petition is not a question of if but when. The Third Circuit ruling in Kalshi’s favor, combined with the likely disagreement from other circuits, creates exactly the kind of legal uncertainty the Supreme Court exists to resolve. The April 16 Ninth Circuit oral arguments are the next critical data point. If the Ninth sides with states, the Supreme Court timeline accelerates significantly.
For bettors and traders who have come to rely on prediction markets for sports, politics, and financial event contracts, the next several months of courtroom activity may matter more than any single platform feature or market launch. The rules of the game are still being written.