A group of US state gaming lawmakers (NCLGS) filed an amicus brief with the US Supreme Court on Tuesday, urging the justices to take up the case of New Jersey versus prediction market platform Kalshi and supporting the petition by the state's attorney general and gaming regulators for a writ of certiorari.

New Jersey Petition Filed on September 2

The petition asks the high court to review a dispute that could clarify whether jurisdiction over prediction market companies belongs to state authorities or federal agencies. The filing comes as part of an appeal following a decision by the Third Circuit Court of Appeals.

Lawmakers Argue Regulatory Risks for Betting

In its amicus brief, NCLGS argues that a decision in favor of Kalshi "would deprive states of the ability" to regulate sports betting on prediction markets and would cause "substantial harm and confusion." The group maintains that "matters related to gambling" should remain under state authority. The document does not address the argument that event contracts traded on federally regulated markets fall under the exclusive jurisdiction of the CFTC.

Kalshi Has Until November 9 to Respond

Kalshi has not yet issued an official response to the petition. The company has until November 9 to submit its position in the case; previously, a company representative stated that it cannot be "regulated by 50 different regulators."