Nebraskans for Medical Marijuana submitted enough signatures to place its medical cannabis legalization measure before voters in November, but opponents are asking the state’s top election official to reject the proposal, according to an AP News report.

Mark Fahleson, a Lincoln-based attorney and former Nebraska Republican Party chairman, has submitted a letter to Secretary of State Bob Evnen arguing that the measure violates the state constitution, the news outlet reported.

Opponents to a casino ballot measure made similar arguments against that proposal, which Evnen ultimately rejected, according to AP News. Groups supporting the casino initiative have since filed a challenge in court over Evnen’s decision, according to the Omaha World-Herald.

Fahleson’s letter comes as Nebraskans for Medical Marijuana received official confirmation from the state that it gathered enough signatures to qualify its initiative for the November ballot, AP News reported.