Richard Glossip, an Oklahoma death row inmate, and Gentner Drummond, the state's attorney general, are asking the Supreme Court to grant Glossip a new trial.

The Supreme Court grappled Wednesday with an appeal from an Oklahoma death row inmate who even the state’s conservative attorney general believes should not be executed, with some justices signaling a willingness to let state courts further review allegations that prosecutors withheld evidence in the case.

Oklahoma, with the highest per capita execution rate, asked the Supreme Court to give a convicted murderer on death row a new chance to prove his innocence.