The U.S. Senate on April 30, 2026, unanimously approved a resolution banning sitting senators from betting on prediction markets for political, military, and other event outcomes. Led by Senator Bernie Moreno (R-OH), the measure revises Senate Rule XXXVII to address growing ethical concerns amid a surge in event contract trading.
Key Provision: Ban on Event Contracts
The new rule explicitly prohibits any senator from entering into contracts where payouts depend on whether a specific event occurs. This covers platforms such as Polymarket and Kalshi, which have seen explosive growth during the 2026 election cycle. The ban took effect immediately upon passage, with violations referred to the Senate Ethics Committee.
Moreno, a vocal critic of lawmakers' side hustles, called the resolution a necessary step to restore public trust. “Using the U.S. Senate as a vehicle for personal financial gain is a fundamental betrayal of the American people,” he said. The unanimous vote reflects rare bipartisan consensus on the need for transparency in the digital age.
Catalysts: Two Scandals in April
The push for the ban accelerated after two major incidents in late April. On April 22, regulated exchange Kalshi fined three congressional candidates for betting on their own election races, raising alarms about market manipulation. The next day, news broke that a U.S. Army special forces soldier was arrested for allegedly using classified intelligence to win over $400,000 on Polymarket—a bet tied to a military operation involving Venezuelan leader Nicolas Maduro.
These cases provided the political momentum needed for a swift vote. While the Senate acted within its own rules, Democratic lawmakers simultaneously pressured the Commodity Futures Trading Commission (CFTC) to implement broader industry-wide safeguards against insider trading.
Scope and Industry Impact
The rule change applies strictly to the 100 members of the Senate and does not yet cover House members, congressional staff, or executive branch officials. However, industry leaders like Kalshi and Polymarket have already introduced voluntary restrictions on political figures.
Meanwhile, Polymarket is engaged in talks with the CFTC to lift its 2022 U.S. ban and fully return its blockchain-based exchange to American traders. This Senate action may influence the regulator's stance on prediction markets.
The resolution includes a narrow exception for traditional insurance contracts to ensure standard financial planning remains unaffected. The amendment was proposed by Senator Alex Padilla (D-CA) during drafting.
Violations of the new rule will now be handled promptly by the Senate Ethics Committee. While the ban is not a law, the unanimous consent marks a rare moment of bipartisan agreement on the need for integrity in the digital era. As the 2026 election cycle continues, all eyes are on whether the House of Representatives will follow suit.