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Warren and Curtis seek safeguards from Kalshi and Polymarket over election markets

Regulation

US senators Elizabeth Warren and John Curtis asked Kalshi and Polymarket for details of safeguards against insider trading and manipulation on election-related prediction markets. Their bipartisan letter also sought information about previous enforcement actions and suspected violations of Commodity Futures Trading Commission rules. The senators cited concerns about candidate trading and alleged manipulation, including cases involving Kalshi and Polymarket.

The senators’ questions could prompt closer scrutiny of controls on election-related contracts at both operators.

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Regulation

Brazilian resolution blocks Polymarket and Kalshi over election contracts

Brazil's National Monetary Council (CMN) barred contracts tied to election results and other events unrelated to economic and financial indicators from May 2026, the report said. The measure also led to Polymarket and Kalshi being blocked in Brazil. Specialists warned that users may mistake market probabilities for confirmed election results.

Brazil's National Monetary Council (CMN) barred contracts tied to election results and other events unrelated to economic and financial indicators from May 2026, according to a report. The measure also led to Polymarket and Kalshi being blocked in Brazil, the report said. Polymarket and Kalshi allow users to trade contracts whose value depends on election results, according to the report.

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