Senate Indian Affairs Roundtable Puts Prediction Markets Under Scrutiny
An August 4 roundtable moved the event-contract fight from the courts to the committee with jurisdiction over Indian affairs.
The U.S. Senate Committee on Indian Affairs convened a roundtable on August 4, 2026, titled “Tracking Prediction Markets' Exponential Growth: Tribal Implications and Beyond,” giving tribal leaders their most direct congressional forum yet to argue that federally regulated event contracts are functioning as unlicensed sports wagering on Indian lands. The session marked a shift in the prediction markets tribal gaming fight from courtrooms, where tribes have had mixed results, to the legislative arena where the underlying statutory conflict would have to be resolved.
Committee Chair Lisa Murkowski of Alaska and Vice Chair Brian Schatz of Hawaii led the discussion, joined by senators including John Boozman of Arkansas, Tina Smith of Minnesota, Catherine Cortez Masto of Nevada, Maria Cantwell of Washington and Ben Ray Luján of New Mexico — a roster that maps closely onto states with significant tribal gaming economies.
The case tribal leaders brought to the committee
The tribal witnesses framed the issue as jurisdictional rather than competitive. Mark Macarro, president of the National Congress of American Indians, and Jamie Hummingbird, chairman of the National Tribal Gaming Commissioners and Regulators, told the committee that sports event contracts sold to users physically located on reservations amount to Class III gaming conducted without a compact, without a tribal gaming ordinance, and without the regulatory apparatus IGRA requires.
That argument has a specific statutory shape. Under IGRA, Class III gaming on Indian lands must be authorized by a tribal ordinance, conducted under a tribal-state compact or secretarial procedures, and regulated by a tribal gaming regulatory authority subject to National Indian Gaming Commission oversight. Prediction market operators registered with the Commodity Futures Trading Commission satisfy none of those conditions, because they take the position that event contracts are derivatives rather than wagers. Tribal regulators argue that the distinction collapses when the contract settles on the outcome of a single football game.
The committee also heard from Mathura Sridharan, solicitor general of Ohio, whose office has been among the state actors pressing the same preemption question, and from Dr. Harry Levant of the Public Health Advocacy Institute, who addressed the consumer-protection and problem-gambling dimension. The presence of both a state law officer and a public-health voice was notable: it framed the dispute as one where tribal and state regulators have converging rather than competing interests, a departure from the usual alignment in gaming policy.
Why the roundtable format mattered
A roundtable is not a legislative hearing and produces no markup. But it does establish a record, and it signaled that the committee intends to treat prediction markets as an Indian affairs question rather than leaving it entirely to the Agriculture committees that oversee the CFTC. That jurisdictional framing is itself a win for tribal advocates, who have argued that any statutory clarification of event contracts must be measured against IGRA and against existing compacts.
Murkowski and Schatz have separately urged the CFTC to consult with tribes and to extend the comment period on its prediction markets rulemaking, invoking the federal trust responsibility and the government's consultation obligations. Those requests track the concerns tribes raised when the proposed rule first circulated, which we covered in our analysis of the CFTC rule and the tribal sovereignty response.
The committee's interest is not whether prediction markets should exist. It is whether a federal financial regulator can, by classification alone, authorize activity inside reservation boundaries that Congress reserved to tribal governments and their compacting partners.
The litigation backdrop
Congress is not writing on a blank slate. Tribes in California sought a preliminary injunction in the Northern District of California to stop sports event contracts from being offered on their lands; the district court declined, and the Ninth Circuit heard argument on the appeal in July 2026, with the panel pressing hard on how a nationwide platform accounts for users inside reservation boundaries. Our coverage of the Ninth Circuit oral arguments lays out the questions the judges focused on.
State courts have moved faster in places. A Washington state judge has ordered geofencing measures aimed at blocking certain event contracts for users in that state, with compliance deadlines running through late summer. Practitioners on both sides increasingly expect the core question to reach the Supreme Court, which is precisely the outcome tribal leaders told the committee Congress could avoid by legislating clearly.
What a legislative fix would have to do
Tribal organizations have converged on a narrow ask rather than a broad prohibition. The core elements: an explicit statement that event contracts settling on sporting outcomes are gaming for purposes of federal law; preservation of IGRA's allocation of authority over Indian lands; and a requirement that federal financial regulators consult tribes before authorizing products that touch reservation economies. Several of those elements have been floated as amendments to pending market-structure legislation rather than as a standalone bill, a strategy that trades visibility for a realistic vehicle.
The stakes are quantifiable. Tribal gaming produced a record $46.2 billion in gross gaming revenue in fiscal year 2025 across 545 operations, and sportsbook exclusivity is a load-bearing element of compacts in several states. A parallel, uncompacted channel does not have to capture a large share of handle to unsettle those agreements — many contain exclusivity triggers that reduce or eliminate revenue-sharing payments if competing wagering appears in the market. Our explainer on compact revenue sharing covers how those triggers are typically drafted.
No legislative timeline emerged from the roundtable, and none was expected. What emerged instead was a record, a committee willing to claim the issue, and a set of witnesses whose arguments will be cited in briefs regardless of what Congress does next.