Congressional lawmakers are pushing for an investigation into large bets placed on the prediction market platform Polymarket tied to the possibility of a U.S.-Iran military conflict, raising concerns about whether financial activity on such platforms could intersect with national security decision-making.

The calls for oversight come amid heightened U.S.-Iran tensions. President Trump issued warnings to Iran regarding fees being levied on tankers passing through the Strait of Hormuz, a critical global shipping chokepoint, adding urgency to the broader political environment surrounding the betting controversy.

Prediction markets like Polymarket and Kalshi allow users to wager on real-world outcomes, including geopolitical events. Critics have raised the possibility that unusually large or well-timed bets on war outcomes could reflect access to non-public information, or could create perverse incentives around foreign policy decisions. Legislators are asking whether existing financial regulations are adequate to address these scenarios.

The debate over prediction markets and their regulation has been building for some time. Kalshi, another major prediction market platform, has been expanding its offerings and public profile, drawing attention from both investors and regulators. The Iran-related bets have sharpened that scrutiny considerably, prompting questions about transparency and the appropriate limits of what can be wagered on.

No specific individual or entity has been publicly accused of wrongdoing in connection with the Polymarket bets. The investigation calls are framed primarily as a matter of ensuring proper oversight of a rapidly growing and largely novel financial sector operating at the intersection of markets and geopolitics.