Veteran U.S. Supreme Court lawyer Paul Clement has taken another case to the high court on behalf of Oklahoma, this time in defense of the state’s “modest” regulations of “self-dealing” pharmacy middlemen known as pharmacy benefit managers.

In a petition for certiorari filed this month, Clement has asked the justices to review a recent U.S. Court of Appeals for the Tenth Circuit decision that federal law preempts a 2019 Oklahoma statute regulating PBM business practices. That decision followed a court challenge to the law filed by the Pharmaceutical Care Management Association, a trade group representing PBMs.