The National Football League has formally aligned with New Jersey in its legal battle against prediction market operator Kalshi. In an amicus brief filed Thursday, the league urged the Supreme Court to take up New Jersey’s appeal of a Third Circuit ruling. That lower court decision classified Kalshi’s sports event contracts as "swaps" under the Commodity Futures Trading Commission’s exclusive jurisdiction, thereby shielding them from state gambling regulations. This creates a direct conflict with rulings from the Sixth and Ninth Circuits, which have determined such contracts fall under state oversight.

The NFL argues that Dodd-Frank’s definition of a swap applies only to instruments hedging existing risk, not bets creating new risk. The league detailed specific grievances regarding consumer protection and market integrity, noting that operators declined requests to ban easily manipulated bets involving injuries or officiating. The brief highlighted that Kalshi allows trading by individuals aged 18, whereas most states require bettors to be 21. Additionally, the NFL pointed to the CFTC’s limited resources, citing its 543 employees nationwide, and noted that NFL-related contracts accounted for $1.8 billion of the $3.3 billion traded across prediction markets on the season's first Sunday. Represented by former U.S. Attorney General William Barr, the league seeks a resolution before the 2027 season. If the Supreme Court upholds the Third Circuit’s view, the NFL stated it would push regulators and Congress for stronger protections rather than seeking to eliminate prediction markets entirely.