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Tribal Sovereignty Becomes the New Front in US Prediction Markets War as New Mexico Tribes Sue Kalshi

Four pueblos and tribes invoke IGRA in a federal complaint filed 12 May, days after a Wisconsin judge gave the Ho-Chunk Nation a "likelihood of success" finding and Minnesota's legislature passed an explicit prediction-market ban.

Category: iGaming News - USA · By Growl Games Editorial Team · Sat May 16 2026 · Updated Thu Jul 23 2026

Tribal Sovereignty Becomes the New Front in US Prediction Markets War as New Mexico Tribes Sue Kalshi

Contents

1. Summary

The legal fight over US prediction markets opened a new front this past week as tribal sovereignty claims pushed into the centre of the dispute. Four New Mexico tribes filed a 34-page federal complaint against Kalshi on 12 May, alleging the company's sports-event contracts amount to illegal sports betting on tribal lands in violation of the Indian Gaming Regulatory Act (IGRA). On 11 May, a federal judge in Wisconsin denied the Ho-Chunk Nation's request for an immediate injunction but ruled the tribe had shown "likelihood of success" on its underlying IGRA claims — a finding the tribe described as a major win. On 13 May, Minnesota's legislature passed a public-safety omnibus bill containing an explicit prediction-markets ban, the first US state-level statutory prohibition aimed directly at the platforms.

2. The New Mexico Complaint

The Mescalero Apache Tribe and the Pueblos of Isleta, Pojoaque and Sandia filed in US District Court in Albuquerque on 12 May. The complaint alleges that Kalshi's sports markets are "functionally indistinguishable from traditional sports wagering" and that IGRA gives tribal gaming operators exclusive authority over Class III gaming on their lands. New Mexico law permits sports betting only in person at tribal gaming facilities and only for patrons aged 21 and older; Kalshi's app allows users from 18. The tribes argue Kalshi could have geofenced tribal boundaries but chose not to, and seek an injunction, declaratory relief, civil penalties and punitive damages. According to the latest figures, 14 New Mexico tribes and pueblos generated more than $266 million in adjusted net win in Q4 2025. This is the third tribal action against Kalshi, following filings in California and Wisconsin.

3. Wisconsin: Ho-Chunk Wins "Likelihood of Success"

On 11 May, a federal judge in Wisconsin denied the Ho-Chunk Nation's motion for a preliminary injunction against Kalshi but affirmed the tribe had shown "likelihood of success" on its IGRA claims. The tribe's August 2025 complaint alleges Kalshi illegally provides sports betting on tribal land. Legal observers have framed the ruling as potentially opening the door to a nationwide wave of tribal IGRA actions. In a separate California matter, the Ninth Circuit rejected the Blue Lake, Chicken Ranch and Picayune Rancherias' motion to align their appeal against Kalshi and Robinhood with a Nevada-related panel.

4. Minnesota Adds an Explicit Statutory Ban

Minnesota's legislature on 13 May passed SF 4760, a public-safety omnibus bill containing language banning prediction markets. The Senate had previously approved a standalone version, SF 4511, by a 56-10 vote on 30 April; when it stalled in the House, lawmakers folded the language into the omnibus. After the Senate initially rejected the House-amended version, a conference committee retained the prediction-market provisions in the compromise bill. The measure now heads to Governor Tim Walz. If signed, Minnesota becomes the first US state with an explicit statutory ban on prediction markets, with criminal provisions taking effect on 1 August 2026. The bill covers sports, politics, war, natural disasters, deaths, court cases, short-term weather, pop-culture outcomes and statements. The CFTC has signalled it is monitoring developments and considering a possible lawsuit, per a Semafor report cited by Gambling Insider.

5. The IGRA vs CEA Argument

Kalshi's defence in state-led cases has been that the Commodity Exchange Act (CEA) preempts state gambling laws — an argument that has succeeded twice this spring with the 5 May Arizona injunction and the earlier Third Circuit affirmation in New Jersey. The tribal cases raise a separate, narrower question: whether IGRA, as a specific federal statute regulating gaming on Indian lands, can be overridden by the CEA's general derivatives framework. The New Mexico complaint argues the existence or absence of a "house" is irrelevant under IGRA; that Kalshi's server location does not matter so long as the user is physically on tribal lands when wagering; and that Dodd-Frank provisions in commodities law expressly prohibit listing contracts involving "gaming." Kalshi has marketed itself as the "first app for legal sports betting in all 50 states." Daily trading volume has surged from roughly $4 million in late 2024 to nearly $800 million, with sports contracts driving most of that growth.

6. What's Next

If Governor Walz signs the Minnesota bill, Kalshi is widely expected to file suit, and the CFTC may join. The Wisconsin "likelihood of success" finding is likely to encourage further tribal actions; US Rep. Gabe Vasquez (D-NM) said last month he is working on federal legislation prohibiting prediction-market sports contracts. Separately, CFTC Chair Michael Selig has signalled the agency could consider "different rules" for prediction-market products that resemble traditional casino offerings such as parlays and prop bets — a notable concession given DraftKings' 13 May launch of its parlay-style Combos feature on its Predictions platform. For sportsbook operators, the next 30 days will help define whether the tribal-IGRA argument creates a parallel enforcement track that CEA preemption cannot fully shut down.

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