The U.S. Senate has unanimously passed a rule banning senators from trading on prediction markets, effective immediately, in a decisive response to mounting concerns over insider trading and unethical event contracts. The decision, enacted on April 30, targets platforms like Kalshi and Polymarket, where bets on elections, military actions, and even violent outcomes have raised ethical alarms.
This move follows a series of high-profile incidents that have intensified scrutiny of these platforms. On April 22, Kalshi suspended and fined one U.S. Senate candidate and two House candidates for placing bets on their own campaigns, a clear violation of the platform’s rules. Just a day later, on April 23, U.S. Army Special Forces soldier Master Sgt. Gannon Ken Van Dyke was arrested for allegedly using classified information to wager on Polymarket, netting nearly $410,000 from bets tied to the capture of Venezuelan leader Nicolás Maduro.
Democratic lawmakers have pushed for broader oversight, with a group calling on the Commodity Futures Trading Commission to establish rules preventing insider trading and banning event contracts tied to elections, wars, or military actions without a valid economic hedging purpose. Representative Greg Casar and Senator Chris Murphy, both Democrats, have publicly championed the cause, spotlighting the risks during a March 17 news conference at the U.S. Capitol.
READ: Kalshi Bans Three Candidates Over Self-Bets in 2026 Midterm Primaries
State-level action is also gaining traction, with Minnesota poised to join the crackdown. A bill to ban most prediction market bets cleared a key Senate committee on April 28, spurred by controversy over DFL state Senator Matt Klein, who admitted to placing a $50 bet on his own congressional primary race. Klein, now suspended from Kalshi for five years and fined, co-authored the legislation and called for clearer regulations after his self-described mistake.
Opposition to state bans persists, however. In Minnesota, Republican floor leader Rep. Harry Niska questioned the legal standing of such measures against federal commodities laws, noting the Commodity Futures Trading Commission’s apparent claim to exclusive jurisdiction. Meanwhile, the federal government has sued three states—Connecticut, Arizona, and Illinois—this month for their efforts to curb prediction market activity.
READ: US Special Forces Soldier Arrested for $400,000 Bet on Maduro Capture
The debate over prediction markets is far from settled, as platforms tout their utility in forecasting outcomes while critics highlight the potential for abuse. Minnesota House Democrats, including Rep. Zack Stephenson, have signaled strong support for a ban, citing the rapid rise of these markets and their adverse consequences.
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