Key Takeaways:

• Sen. Bernie Moreno led the U.S. Senate to pass a unanimous ban on prediction market trading on April 30, 2026.
• Prediction platforms like Polymarket and Kalshi saw 2026 volume surges amid growing insider trading scandals.
• Senate Rule XXXVII now bars 100 members from betting on event contracts to ensure public trust in policy.

Senator Bernie Moreno Leads Senate Charge to Prohibit Betting on Event Contracts

Introduced by Senator Bernie Moreno (R-OH) just one week ago, the measure amends the Standing Rules of the Senate to address intensifying ethical concerns. The move follows a series of high-profile scandals where nonpublic information was allegedly used to profit on event-based platforms.

The resolution, which took effect immediately upon its April 30 passage, targets the rapidly growing sector of event contracts. Platforms like Polymarket and Kalshi have gained massive traction during the 2026 election cycle, allowing users to bet on everything from military operations to legislative votes.

By amending Rule XXXVII, the Senate has effectively cordoned off its members from these digital gambling hubs. The new language explicitly prohibits any member from entering into contracts where payments depend on the occurrence or nonoccurrence of a specific event.

Moreno, who has been a vocal critic of congressional “side hustles,” framed the resolution as a necessary step to restore public integrity. He argued that treating the U.S. Senate as a vehicle for personal financial gain is a fundamental betrayal of the American people.

The push for the ban was accelerated by two major incidents in late April that shook the industry. On April 22, the regulated exchange Kalshi fined three congressional candidates for betting on their own races, raising alarms about market manipulation.

Just one day later, news broke that a U.S. Army Special Forces soldier was arrested for allegedly using classified intelligence to win over $400,000 on Polymarket. The bet centered on a military operation involving Venezuelan leader Nicolás Maduro.

These incidents provided the political momentum needed for a unanimous voice vote. While the Senate acted internally, Democratic lawmakers are simultaneously pressuring the Commodity Futures Trading Commission (CFTC) to implement broader industry-wide safeguards against insider trading.

The scope of this specific rule change is limited exclusively to the 100 members of the Senate. It does not currently apply to members of the House of Representatives, congressional staffers, or officials within the executive branch.

Despite its narrow application, the move signals a shift in how Washington views the intersection of decentralization and governance. As prediction markets become more liquid, the potential for “information leakage” from the halls of power has become a primary concern for regulators.

Industry leaders at Kalshi and Polymarket have already begun implementing self-imposed restrictions on political figures. However, the Senate’s proactive rule change provides a formal ethical boundary that was previously a legal gray area.

The resolution includes a minor carve-out for traditional insurance contracts to ensure that standard financial planning remains unaffected. This adjustment was made following a proposal by Senator Alex Padilla (D-CA) during the drafting process.

Violations of the new rule will now trigger immediate review by the Senate Ethics Committee. While the ban is not a statutory law, the unanimous consent reflects a rare moment of bipartisan agreement on the need for transparency in the digital age.

As the 2026 election cycle continues, the focus now shifts to whether the House will follow suit. For now, the Senate has sent a clear message that the Capitol is no place for speculators looking to hedge their bets on the future of the country.