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Associated Press | Matt York

The Arizona Supreme Court is set to release its decision Thursday in a constitutional challenge to a new tax on high earners that was designed to increase school funding and approved by the state’s voters in November.

Matt York | Associated Press

Progressive groups that convinced voters last year to raise taxes on the wealthy to boost school funding have filed paperwork to block big new tax cuts enacted by the Republican-controlled Arizona Legislature and signed by GOP Gov. Doug Ducey this week.

The groups filed a pair of voter referendums Friday with the Secretary of State’s office, said David Lujan, a former Democratic lawmaker who leads the group Stand for Children.

Associated Press | Scott Applewhite

A trial court judge on Tuesday threw out several legal challenges to a new voter approved tax on high-earning Arizonans, leaving just one additional issue raised by challengers to Proposition 208 in play while the state Supreme Court is considering whether the measure is constitutional.