MADISON, Wis. (AP) -- Wisconsin state superintendent Tony Evers is upset with Gov. Scott Walker over an education reform bill they worked together on but that doesn't place charter and private voucher schools under a new accountability system.

Evers says the bill misses an opportunity to deliver on promises made by Walker, legislators and education leaders, including advocates for charter and private voucher schools.

Walker spokesman Cullen Werwie told the Wisconsin State Journal in a story published Friday that the accountability changes weren't included in the bill because there were too many uncertainties about what legislative changes are needed.

Werwie says Walker supports taking that up after the U.S. Department of Education clarifies what changes are needed in the state's waiver application from the federal No Child Left Behind law.