U.S. Representative Brian Steil plans to add language to the House congressional stock ban bill to cover prediction markets such as Polymarket and Kalshi, widening the measure beyond traditional securities trading. The provision would bar lawmakers from betting on elections and public policy through event-based markets, which let users trade contracts tied to future outcomes. Bloomberg Government reported the plan on the 5th. The move comes as the Senate has already advanced ethics rule S.Res.708, which would prohibit prediction market use by senators and staff, signaling a broader push to address conflict-of-interest concerns tied to lawmakers taking positions on political or policy events.