Oklahoma’s Republican Attorney General Gentner Drummond on Friday sued to stop a state board from establishing and funding what would be the nation’s first religious public charter school after the board ignored Drummond’s warning that it would violate both the state and U.S. constitutions.

Drummond filed the lawsuit with the Oklahoma Supreme Court against the Oklahoma Statewide Virtual Charter School Board after three of the board’s members this week signed a contract for the St. Isidore of Seville Catholic Virtual Charter School, which is sponsored by the Archdiocese of Oklahoma City.

“Make no mistake, if the Catholic Church were permitted to have a public virtual charter school, a reckoning will follow in which this state will be faced with the unprecedented quandary of processing requests to directly fund all petitioning sectarian groups,” the lawsuit states.