Wisconsin Sports Betting Law Faces Constitutional Challenge

A coalition of conservative organizations has launched a legal challenge against Wisconsin’s recently approved online sports betting framework, arguing that state lawmakers exceeded their constitutional authority when they passed legislation paving the way for mobile wagering across the state.

The lawsuit, filed in Waukesha County Circuit Court, seeks to stop implementation of Wisconsin Act 247, a measure signed by Governor Tony Evers in April 2026 that established a pathway for online sports betting through federally recognized tribal nations. The case was brought by the Wisconsin Institute for Law & Liberty (WILL) on behalf of the Brown County Taxpayers Association and Citizens Defending Liberty.

Named defendants include Governor Evers, Wisconsin Division of Gaming Administrator John Dillett, Wisconsin Department of Administration Secretary Kathy Blumenfeld and Office of Indian Gaming and Regulatory Compliance Indian Gaming Audit Director Jessie Dushek.

At the center of the dispute is whether the Wisconsin Legislature had the authority to authorize online sports betting under the state constitution. According to the plaintiffs, a constitutional amendment approved by Wisconsin voters in 1993 restricts lawmakers from expanding gambling beyond a limited number of approved activities, including bingo, state-licensed raffles, pari-mutuel on-track wagering and the Wisconsin Lottery.

Legal Dispute Centers on Constitutional Limits

Supporters of the lawsuit argue that lawmakers attempted to permit online sports betting by altering statutory definitions rather than directly authorizing a new form of gambling.

Wisconsin’s legislation revised the definition of a “bet,” excluding wagers on sporting events when the computer server processing the transaction is located on federally recognized tribal land. Lawmakers approved the measure with bipartisan support in March before it was signed into law the following month.

WILL contends that changing the definition effectively legalized conduct that was previously prohibited, which it argues amounts to authorization of gambling and therefore conflicts with constitutional restrictions.

“These statutory changes in Act 247 violate the Wisconsin Constitution’s unequivocal restriction on the legislature’s ability to authorize gambling,” the complaint states, according to Wausau Pilot & Review.

Lucas Vebber, deputy counsel for WILL, said the organization’s challenge focuses on legislative authority rather than on whether sports betting itself should be permitted. “The reasoning behind it is because the Legislature passed a bill that they don’t have the authority to pass,” Vebber said.

He also emphasized that the case is not intended as a referendum on gambling policy. “This lawsuit is not pro-gambling or anti-gambling,” Vebber said. “If the people of Wisconsin want sports betting anywhere, on their phone or anywhere that they want it, all they have to do is repeal the constitutional amendment.”

Speaking about the legal theory behind the challenge, Vebber argued that lawmakers cannot avoid constitutional limits simply by modifying statutory language.

“But of course, I think our counter to that is if something that was previously illegal is now no longer illegal, you’ve authorized it, right?” said Vebber. “So, by just changing the definition, they’ve made certain things lawful that were not lawful previously, and that itself is a form of authorization that’s not allowed under the constitution.”

Tribal Exclusivity Also Draws Scrutiny

A second major element of the lawsuit concerns the structure of Wisconsin’s planned online sports betting market. Under the legislation, online wagering would operate through a model similar to the system currently used in Florida. Mobile bets would be processed through servers located on tribal lands, and Wisconsin’s federally recognized tribes would obtain control over the online sports betting market through amendments to their gaming compacts with the state.

Those compact amendments would also require approval from the Bureau of Indian Affairs before online wagering could begin. The plaintiffs argue that the framework grants exclusive benefits to tribal nations and creates an unequal system. According to the complaint, the law establishes a benefit available only to tribal members.

“This violates the United States Constitution’s Guarantee of Equal Protection under the Fourteenth Amendment,” the lawsuit states.

WILL further argues that any future compact amendments designed to implement the law would exceed the authority granted under state law. The complaint describes such potential amendments as “ultra vires,” a legal term referring to actions taken beyond authorized powers.

Debate Continues Over Future of Online Betting

The legislation advanced despite debate among lawmakers and stakeholders. Governor Evers signed Assembly Bill 601 after it passed the Wisconsin Senate by a 21-12 vote in March.

Supporters argued that online sports betting already occurs in Wisconsin through unregulated channels and that the new framework would give tribes and state authorities greater oversight. Several tribal nations supported the legislation.

Some Republican lawmakers opposed the measure due to concerns about gambling expansion, while major sportsbook operators DraftKings and FanDuel also criticized the structure. The companies argued that the market model would not be commercially viable for them. Under the legislation, tribes would retain 60 percent of revenue generated from online wagering.

The lawsuit notes polling data from Marquette University Law School indicating that 64 percent of respondents oppose legalizing online sports betting in Wisconsin.

For now, online wagering cannot move forward until gaming compacts are updated between the state and Wisconsin’s 11 federally recognized tribes. Vebber pointed to those pending negotiations as a key reason for seeking judicial intervention before implementation advances.

The plaintiffs are asking the court to declare the law unconstitutional, prevent state officials from administering mobile sports betting and block future gaming compact amendments intended to facilitate statewide online wagering.

Governor Evers’ administration has already signaled opposition to the lawsuit. In a social media response following the filing, spokesperson Britt Cudaback accused WILL of targeting tribal sovereignty and stated that the governor would oppose those efforts.