Senator Blumenthal Is Demanding Every Major Sports League Reveal Its Gambling Partnerships

Senator Richard Blumenthal is turning up the heat on professional sports leagues and their gambling relationships. The Connecticut Democrat sent formal letters to the commissioners of the NFL, NBA, MLB, NHL, MLS, and the NCAA around April 9-10, 2026, demanding a full accounting of every commercial deal they have with sportsbooks, daily fantasy operators, and prediction market platforms. The deadline he set: May 1.

What Blumenthal Is Actually Asking For

The letters are not a friendly inquiry. Blumenthal is asking each league to produce a comprehensive breakdown of all gambling-related commercial agreements — not just the official sportsbook partnerships most fans already know about, but also any deals with DFS operators and, crucially, prediction market platforms. He is citing concerns about gambling addiction, player safety, and competitive integrity, and the tone of the correspondence makes clear he views the current level of disclosure as inadequate.

The timing is notable. In the six months leading up to Blumenthal’s letter, MLS, the NHL, and MLB all signed new partnership agreements with prediction market operators. The rapid normalization of prediction markets across major league sports has clearly caught the attention of lawmakers who were already uneasy about the pace of sportsbook integration. Adding prediction markets to the mix — platforms that operate in a regulatory gray zone that the CFTC has been actively fighting to defend from state oversight — has amplified that concern considerably.

The NCAA Stands Alone

One detail that stands out in this story: the NCAA is the only organization on Blumenthal’s list that does not currently have an official sportsbook partnership. Every major professional league has embraced commercial gambling deals to some degree, but the NCAA has held back, at least on the sportsbook side. That has not stopped college sports from being among the most heavily bet markets in the country, which creates its own set of integrity questions that Blumenthal’s letters will likely surface.

The professional leagues, meanwhile, have gone all-in on gambling revenue. The NFL has multiple official sportsbook partners. The NBA integrated sports betting partnerships deep into its broadcast and arena experiences. MLB has official odds displayed in ballpark apps and league media properties. The NHL has similar arrangements. These are not fringe relationships — they are central to how modern professional sports leagues generate commercial revenue, and Blumenthal knows it.

The Prediction Market Wrinkle

The prediction market dimension of these letters adds a layer of regulatory complexity that goes well beyond the typical sportsbook debate. Platforms like Kalshi and Polymarket have been expanding aggressively into sports event contracts, and the CFTC under its current leadership has claimed exclusive federal jurisdiction over those markets, going so far as to sue Connecticut and two other states for attempting to regulate prediction market activity at the state level.

That puts Blumenthal in a peculiar position. His home state of Connecticut is literally being sued by the CFTC for trying to regulate the exact platforms he is now demanding sports leagues disclose partnerships with. He is, in effect, using his Senate platform to create pressure from a different direction — not regulation, but transparency and public accountability.

Whether that leads anywhere concrete is genuinely unclear. Congress has shown limited appetite for comprehensive sports gambling legislation even as the market has exploded since the Supreme Court’s 2018 PASPA ruling. But congressional letters demanding disclosure can serve a purpose beyond legislation. They generate headlines, create pressure on league commissioners to publicly defend their gambling relationships, and build a public record that can be used if and when more formal hearings or legislation moves forward.

What the Leagues Will Have to Reckon With

The leagues that will have the most uncomfortable answers to Blumenthal’s questions are the ones with the deepest and most recent prediction market ties. MLS, NHL, and MLB will each need to explain the terms and scope of deals they signed in the past several months. Those disclosures, if they actually materialize by the May 1 deadline, could reveal just how far the commercial integration of unregulated prediction markets has penetrated American professional sports in a very short period of time.

The NFL, as always, operates at a different scale. Its sportsbook partnerships involve the largest dollar figures in the industry, and the league has been careful to maintain certain public distinctions between official partnerships and the actual conduct of sports betting. Those distinctions may be tested if the disclosure process reveals commercial arrangements that blur the line further than the league has publicly acknowledged.

May 1 is not far away. Whether the leagues respond substantively or with carefully worded non-answers will tell us a lot about how seriously they are taking this scrutiny — and how much they think their gambling money is worth defending.