In Jefferson City, a legal challenge has been filed with the Missouri Supreme Court to overturn Proposition A. The petition was discussed by NFIB State Director Brad Jones in an interview with Gabrielle Teiner at Columbia's KMIZ. Proposition A proposes to increase the state's minimum wage to $15 an hour by 2026, mandates paid sick leave for businesses, and introduces new avenues for lawsuits against employers.

Jones expressed concerns that the proposition would lead small business owners to raise prices due to increased costs. "I think it’s going to cost a lot more than what the petition says that it’s going to," he stated. "And I know it’s going to cost small business folks who are going to be forced to raise prices, who we know have been dealing with inflation."

Furthermore, Jones argued that Proposition A violates the Missouri Constitution by not clearly expressing its single subject as required. "We think it has clearly two subjects in that it deals with both the minimum wage and family leave," he explained. "We consider [them] to be two different things."

The legal challenge is supported by several organizations including NFIB, Associated Industries of Missouri, the Missouri Chamber of Commerce and Industry, the Missouri Forest Products Association, the Missouri Grocers Association, and the Missouri Restaurant Association. They argue that Proposition A contains multiple unrelated subjects—minimum wage and earned sick leave—which violates constitutional requirements for ballot initiatives.

Additionally, they claim that the measure's title is unclear and its summary statement along with fiscal note summary are misleading. They also assert that by exempting government entities and certain workers, Proposition A breaches the Equal Protection Clause.