OKLAHOMA CITY (AP) — The Oklahoma Supreme Court ruled Gov. Kevin Stitt's plan to privatize much of the state's Medicaid program is unconstitutional.

In a 6-3 ruling Tuesday, the court determined the Oklahoma Health Care Authority did not have the legislative approval to move forward with the plan, dubbed SoonerSelect.

"We find no express grant of legislative authority to create the SoonerSelect program nor do we find the extant statutes implicitly authorize its creation," the ruling states.

The court also determined a constitutional amendment approved by voters last year to expand Medicaid to...