The Senate voted unanimously to ban its own members and staff from placing bets on prediction market platforms like Polymarket and Kalshi, a rare bipartisan move that took effect immediately and arrived just before lawmakers left Washington for a weeklong recess.
The resolution, pushed by Sen. Bernie Moreno, R-Ohio, passed by voice vote and changed Senate rules on the spot. No senator objected. The measure bars members from entering transactions involving payments or delivery based on the outcome of an event, the core mechanic behind the booming prediction market industry.
The speed and unanimity are notable for an institution that routinely deadlocks over far less. But the backstory explains the urgency: Just The News reported that the resolution came amid allegations a U.S. soldier used classified information to place bets on Polymarket tied to a military operation. That kind of insider-trading risk, magnified when the insiders sit on intelligence and defense committees, made the status quo untenable.
The resolution applies to all sitting senators. An amendment introduced by Sen. Alex Padilla, D-Calif., expanded the ban to cover Senate officers and employees as well, AP News reported. Padilla's amendment also encouraged the House, the executive branch, and the judiciary to adopt similar self-imposed restrictions.
Because the measure was adopted as a change to internal Senate rules rather than as a statute requiring the president's signature, it took effect the moment the vote concluded. That distinction matters. It means the Senate acted within its own authority, bypassing the slower legislative process, but it also means the ban carries no force beyond the chamber itself.
The Washington Times confirmed the vote took place on April 30, 2026.
Moreno, a freshman Republican who sits on the Senate Banking Committee, framed the issue in blunt terms. As Fox News Digital reported, Moreno said his legislation was meant to erase concerns of "side hustles" by lawmakers and increase faith in the institution.
"I don't believe we should trade stocks at all. It's completely insane."
He went further, connecting the prediction market ban to the broader question of whether members of Congress should be making any financial trades that intersect with their official duties.
"I think we should focus on our jobs and have our voters go, 'Hey, this guy's voting this way, because this is the right thing for the state.'"
In a post on X after the vote, Moreno wrote: "Serving in Congress is an honor, not a side hustle. Americans deserve to know that their leaders are here for the right reason!" The Senate's unanimous action on prediction markets marked one of the few ethics-adjacent votes this Congress where no member dissented.
Senate Minority Leader Chuck Schumer, D-N.Y., lauded the move on the Senate floor and immediately turned the spotlight toward the other chamber. "Speaker Johnson should immediately do the same thing in the House," Schumer said.
The Washington Examiner reported that Schumer framed the issue in national-security terms, warning against a future in which elected officials could profit from advance knowledge of military operations, economic crises, or election outcomes.
"We must never allow Congress to turn into a casino where members representing the public can gamble on wars or economic crises or elections."
That language tracks with the broader concern driving the vote. Prediction markets have exploded in popularity since Polymarket's high-profile role during the 2024 election cycle. Platforms now offer contracts on everything from Federal Reserve rate decisions to geopolitical flashpoints, precisely the categories where members of Congress and their staff hold nonpublic information.
On the House side, Rep. Ashley Hinson, R-Iowa, is leading an effort to replicate the Senate's ban. Hinson is running to replace retiring Sen. Joni Ernst, R-Iowa, giving her an added political incentive to champion the ethics measure. But no House vote has been scheduled.
The prediction market platforms themselves backed the Senate's action, a move that reflects industry maturity more than altruism. Polymarket posted on X: "We're in full support of this. Our Rulebook & Terms of Service already prohibit such conduct, but codifying this into law is a step forward for the industry." The platform added: "Happy to help move this forward however we can."
The broader debate over congressional stock trading has simmered for years, with bipartisan proposals to ban or restrict lawmakers' equity trades gaining public support but never quite crossing the finish line. The prediction market ban may succeed where those efforts have stalled precisely because it targets a newer, less entrenched financial activity, one where members have less personal money at stake.
Kalshi co-founder Tarek Mansour also pushed for the House to act, posting on X: "Kalshi already proactively blocks members of Congress and enforces against insider trading. This is a great step to increase trust in our markets by making it an industry standard."
For all the bipartisan goodwill, the resolution leaves significant questions unanswered. It does not appear to address whether former senators, candidates for Senate seats, or family members of sitting senators face any restrictions. It does not specify enforcement mechanisms or penalties for violations. And because it is a Senate rule change rather than a federal statute, it carries no criminal consequences and could theoretically be reversed by a future Senate.
The legislation's scope is also narrow. It targets prediction markets specifically, platforms where users bet on outcomes, rather than the broader universe of insider-information-driven financial activity that has dogged Congress for years. Members can still trade individual stocks, a practice that has drawn scrutiny across both parties and fueled ethics complaints and committee referrals in recent sessions.
Moreno's own comments suggest he sees this as a first step, not a final one. His remark that senators should not trade stocks "at all" points toward a broader fight that neither party has shown the collective will to finish.
The Senate deserves credit for acting swiftly and unanimously. But the ease of the vote also reveals something less flattering: prediction markets are the one financial arena where most senators had little personal exposure. Banning something you weren't doing anyway costs nothing.
The harder question, whether Congress will ever impose meaningful restrictions on the stock trades that have made some members conspicuously wealthy, remains unanswered. Capitol Hill has a long history of ethics scandals that produce symbolic reforms while leaving the most profitable loopholes untouched.
The House has not committed to matching the Senate's move. Speaker Johnson has said nothing publicly. And the broader push to extend restrictions to the executive branch and judiciary, as Padilla's amendment encouraged, has no vehicle, no sponsor, and no timeline.
Meanwhile, the classified-information allegations that helped force the Senate's hand remain unresolved. If a soldier can allegedly exploit intelligence access to profit on Polymarket, the question of what a committee chairman with the same access might do is not theoretical. It is the reason the vote happened at all.
Unanimous votes in the Senate make for good press releases. The real measure of seriousness is whether Congress will touch the trades that actually make its members rich, or whether this week's vote was the easy part, and the hard part never comes.
