- The Senate unanimously banned its own members from prediction markets—but enforcement now falls to a CFTC the Senate hasn’t funded to do the job.
- An Army Special Forces soldier was arrested for using classified intel to win roughly $410,000 on Polymarket—betting on a mission he helped execute.
- The platforms processing billions in geopolitical event contracts have been essentially self-regulated, and last week’s arrests prove that model has limits.
The U.S. Senate voted Thursday to ban its own members from trading on prediction markets—a remarkable act of legislative self-restraint, and an implicit admission that something had gone badly wrong. The rule passed by unanimous consent, meaning no senator objected on the record. That kind of silence usually means everyone wanted to be somewhere else when the vote was called.
The resolution was sponsored by Sen. Bernie Moreno (R-OH), who didn’t mince words afterward. “Serving in Congress is an honor, not a side hustle,” he wrote on X. “Americans deserve to know that their leaders are here for the right reason!” The resolution also urged the House, executive branch, and judiciary to adopt similar rules. The House hasn’t responded yet. The executive branch employs the CFTC, which is running on a skeleton crew.
The immediate trigger was a Department of Justice indictment unsealed last week: Army Special Forces soldier Sgt. Gannon Ken Van Dyke was arrested for using classified information about the raid that captured Venezuelan leader Nicolás Maduro to place bets on Polymarket. Van Dyke won approximately $410,000 on those wagers, according to the DOJ. He pleaded not guilty. The raid was the kind of operation where the outcome isn’t public until it happens—and someone with access to the operational details had a financial stake in how it ended.
The Platform Knows More Than the Regulator
The Van Dyke case was the spark. The fuel was a pattern of political trading on Kalshi and Polymarket that the platforms themselves flagged. On April 22, Kalshi suspended and fined one Senate candidate and two House candidates for trading event contracts related to their own campaigns—an act of political insider trading that would be funny if it weren’t a felony. The platforms have been trying to self-police, but self-policing only works when participants have something to lose.
That same day, a group of Democratic lawmakers called on the Commodity Futures Trading Commission to issue rules “preventing insider trading and corruption in the market and prohibiting event contracts on the outcome of elections, war and military actions in the U.S. or abroad, sports, and government actions without a valid economic hedging interest.” The request covers a lot of ground. It notably does not address the $4.5 trillion in quarterly volume that prediction markets have already processed without regulatory clarity.
Kalshi CEO Tarek Mansour noted his platform already prohibited members of Congress from trading and applauded the Senate move. His platform’s existing ban didn’t stop Van Dyke. The CFTC’s existing rules didn’t stop the candidates Kalshi suspended. The enforcement gap isn’t theoretical—it’s documented, ongoing, and growing.
Scale Has Outrun Oversight
The Senate’s self-ban is the easy part. Congress has always had the power to regulate its own behavior. The hard part is that prediction markets have grown into something that looks less like a curiosity and more like a parallel financial system—one processing more volume in a quarter than some traditional asset classes see in a year.
Polymarket and Kalshi have moved from niche political betting into contracts on geopolitical events, military outcomes, and economic data releases. The Maduro raid contract was a natural extension of what these markets had become: a place where some participants apparently knew more than the odds suggested they should. Platforms keep saying they want regulation. Congress just agreed. The CFTC has been asked to write rules for something its leadership has described as outside its core mandate—while operating with fewer staff than it had a decade ago.
The Senate banned itself from prediction markets on a Thursday afternoon via voice vote. Whether that decision marks the beginning of serious oversight or just a way for lawmakers to feel like they’ve done something remains to be seen. The CFTC hasn’t responded to the Democratic letter yet. Neither has the House.