OKLAHOMA CITY (AP) — A federal indictment unsealed Wednesday accuses a former Oklahoma state senator who already faces state child prostitution charges of also engaging in child pornography and child sex trafficking.

A federal grand jury returned a four-count indictment against two-term former Republican state Sen. Ralph Shortey, who resigned in March after he was arrested on state charges of engaging in child prostitution, transporting a minor for prostitution and engaging in prostitution within 1,000 feet of church. He is alleged to have hired a 17-year-old boy for sex.

Police in the Oklahom...