The Senate unanimously passed a rule Thursday banning senators and staff from trading on prediction markets like Kalshi and Polymarket, effective immediately. The ban follows specific incidents of insider trading: Democratic and Republican candidates suspended for betting on their own campaigns, and an Army Special Forces soldier arrested for using classified information about the Maduro capture operation to win $410,000 in bets. The rule addresses growing concerns about event contracts tied to elections, military actions, and other sensitive outcomes, with both prediction market platforms expressing support for the change.