Warren plans prediction market crackdown as Senate Banking chair

What happened

Sen. Elizabeth Warren is preparing to take the Senate Banking Committee gavel in January and intends to press for tougher oversight of prediction markets, according to a committee aide who spoke to Punchbowl News. Bitcoin Magazine reported the aide's account on Monday. Democrats' sweep of the Nov. 3 midterms put Warren, a Massachusetts Democrat, in line to lead a panel whose jurisdiction includes banking, housing, the Federal Reserve and cryptocurrency.

The aide said Warren would use the committee's investigative powers to examine prediction markets and election betting platforms, with attention to insider trading and attempts to manipulate markets. The issue is not new for Warren: before the midterms she and Sen. John Curtis, R-Utah, opened a bipartisan inquiry into how Kalshi and Polymarket prevent people with material nonpublic information from trading election contracts.

A second aide account, given to Politico's Morning Money and reported by Unchained, placed crypto businesses tied to President Donald Trump's family among Warren's early oversight targets. The aide said Big Tech chief executives, administration officials, Trump family crypto businesses, Wall Street executives and large corporations should keep documents and prepare to answer questions. The aide also said Warren wants to address what was described as a Wild West-style absence of oversight in prediction markets, where the aide said insiders have profited.

Why it matters

The prediction market fight connects crypto policy to federal market regulation. Polymarket is a crypto-native venue that obtained U.S. access through a CFTC-registered exchange after operating offshore for years, while Kalshi runs as a designated contract market under the Commodity Futures Trading Commission. Both fall within the committee's broad oversight orbit. Under Chairman Michael S. Selig, the CFTC has spent 2026 defending such platforms against state gambling laws, suing Wisconsin, New York and others to assert exclusive federal jurisdiction over event contracts on registered exchanges. A Democratic Banking chair pressing the sector is a counterweight to that regulatory stance.

What the data shows

The reported timeline is tightly packed. Democrats won the Nov. 3 midterms; the aide's comments to Punchbowl were published Nov. 9, and the Politico account appeared the same day. The Warren-Curtis letter was dated Oct. 28 and set a Nov. 3 deadline for answers. Warren opposed the CLARITY Act market structure bill, which failed a Senate cloture vote 49-50 on Sept. 15. A federal appeals court on Nov. 3 declined to pause New York's enforcement action against Kalshi and Connecticut's actions against Kalshi and Coinbase. Trump defended his World Liberty Financial stake in a 60 Minutes interview that aired Nov. 8, saying he knows nothing about it and that his sons run the company.

Background

Warren has been the Banking Committee's ranking member since January 2025. In the Oct. 28 letter to Kalshi CEO Tarek Mansour and Polymarket CEO Shayne Coplan, Warren and Curtis asked how the companies stop candidates, campaign staff and others with material nonpublic information from trading election contracts. The letter cited candidates who traded on their own races on Kalshi, including a February 2026 California gubernatorial contest, and pointed to research alleging wash trading and volume manipulation on Polymarket. It also referenced an NPR investigation in which campaign insiders said they traded before polling releases. The senators requested written answers by Election Day, Nov. 3. Kalshi's head of enforcement, Robert DeNault, told Business Insider that the company proactively blocks candidates and campaign staff from trading. Polymarket did not respond to that request for comment.

What is still unclear

Two questions remain open in the reports. Unchained noted that whether other committee Democrats follow Warren's lead is uncertain; Justin Slaughter, a senior adviser at Paradigm, said on Unchained that Warren wants a fierce oversight effort partly to shape the 2028 landscape for Democrats, while describing newer members as lawmakers who do not want a holy war against all of corporate America. Polymarket's response to the senators' letter also remains unaddressed in the reports; the company did not respond to Business Insider's request for comment.

What to watch

Warren's committee could turn the Kalshi and Polymarket letter into hearings, document demands or subpoenas, though the aide's comments describe an agenda rather than finalized actions. The broader committee picture matters: Rep. Maxine Waters is favored to chair the House Financial Services Committee, and former Senate Banking Chair Sherrod Brown, who won an Ohio Senate seat on Nov. 3, is seen as a likely chair of the Senate Agriculture Committee. Both panels also write crypto rules. The aide said Warren will pursue legislation and a robust hearing schedule involving the public and private sectors. Her agenda also includes affordability measures, a cap on credit card interest rates, a bipartisan housing bill with Sen. Tim Scott, R-S.C., who is expected to become ranking member, and scrutiny of private credit and a possible AI bubble. The aide said Warren also plans to keep pressing limits on exports of advanced AI chips, with Nvidia CEO Jensen Huang among expected oversight targets.

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