Ohio Attorney General Dave Yost has asked a federal appeals court to halt an upcoming bellwether trial over the opioid crisis that he called “legally flawed” and “strikes at our Republic’s core structure.”

In a petition for writ of mandamus filed Friday before the U.S. Court of Appeals for the Sixth Circuit, the attorney general argued that the two Ohio counties serving as plaintiffs in the Oct. 21 trial have no legal authority to seek relief from the opioid crisis on behalf of Ohio’s residents. The trial, scheduled to take place in Cleveland, is the first bellwether in the multidistrict litigation and follows a $572 million judgment for the state of Oklahoma in the first opioid trial in the nation.