Tribal Coalition Push Against Kalshi’s Arizona Injunction Bid

A coalition of Native American tribes and 10 tribal associations, including the Indian Gaming Association, has filed an amicus brief supporting Arizona’s response to a motion for preliminary injunction brought by Kalshi. The hearing is set for Friday and is shaping into a defining legal battle over how federal financial regulation intersects with state and tribal gaming authority.

The brief, shared publicly by gaming attorney Daniel Wallach, was prepared by leading tribal gaming lawyers. It argues that Kalshi’s position risks dismantling legal structures for sports betting across tribal and state jurisdictions.

“Kalshi asks this Court to override the unique tribal-state regulatory structure of sports betting in Arizona, abandon the national policy of state and tribal sports-betting regulation, and turn decades of federal law on its head. The Court should not do so,” the brief states.

“America’s history is replete with prospectors taking resources from Indian lands without permission from Tribes. But Congress put a stop to that practice long ago. Yet Kalshi would have this Court believe that, without so much as a whisper of legislative intent, Congress gave it permission to enter Indian lands and siphon gaming revenues away from tribes over such tribes’ objections. Congress did no such thing,” the filing continues.

Tribes accuse Kalshi of bypassing approvals and undermining regulatory authority

The tribes accuse Kalshi of bypassing established licensing systems and diverting revenue away from regulated channels.

“Kalshi, without any licence or approval by the Arizona Tribes or the State, brazenly entered onto state and tribal lands to conduct unregulated gaming with its so-called ‘legal sports betting’ app. In doing so, Kalshi is siphoning vital tribal and state government revenue into its owners’ pockets. For tribes, gaming is not just a commercial endeavour but an existential one,” the filing states.

Beyond the immediate dispute, the brief warns of structural consequences. It argues that accepting Kalshi’s interpretation would weaken Tribal-State Gaming Compacts, which are federally approved agreements to balance economic benefits and regulatory oversight between tribes and state governments. 

The filing also criticises Kalshi’s reliance on the Commodity Exchange Act, describing the company’s argument as a distortion of how federal commodities law interacts with gambling regulation.

Criminal charges deepen conflict between state enforcement and federal claims

The legal conflict has intensified following recent enforcement action by Arizona. According to reporting by The Wall Street Journal, the state has filed criminal charges against Kalshi’s parent entities, alleging the operation of an illegal gambling business without proper licensing.

Arizona Attorney General Kris Mayes stated that the platform accepted bets on sports, elections and other outcomes in violation of state laws that prohibit unlicensed wagering and restrict election betting.

Kalshi has denied the allegations, calling the charges “seriously flawed” and framing the case as a strategic legal move rather than a clear-cut enforcement issue. The dispute has also drawn attention from the CFTC, with its chair, Michael Selig, describing the situation as a jurisdictional conflict.

Growing scrutiny on prediction markets raises wider regulatory questions

The case is unfolding against a backdrop of growing scrutiny of prediction markets. Platforms such as Polymarket have expanded rapidly, raising concerns among regulators about whether these platforms function as de-facto betting services without adhering to established gambling laws.

As prediction markets continue to evolve, questions around their structure and classification are becoming more prominent, particularly as they sit at the intersection of financial instruments and wagering models, as outlined in guides such as What Are Prediction Markets and its broader Prediction Markets Guide.

Several states, including Massachusetts and Michigan, have moved to challenge or restrict such platforms. They argue that users are staking money on uncertain outcomes with financial returns, so the activity resembles gambling regardless of its label.

Kalshi has pushed back by filing legal challenges in multiple jurisdictions, including Arizona, Iowa and Utah. The company maintains that its contracts fall under federal commodities law rather than state gambling statutes. However, recent federal court decisions in Ohio and Nevada have rejected attempts to block state-level restrictions, signalling that courts may not fully accept that distinction.