OKLAHOMA CITY (AP) -- With executions in Oklahoma on hold amid a constitutional review of its lethal injection formula, Republican legislators are pushing to make Oklahoma the first state in the nation to allow nitrogen gas to execute death row inmates.

A bill scheduled for a hearing Wednesday in a House committee would make death by "nitrogen hypoxia" a backup method of execution if the state's current method were determined to be unconstitutional.

The gurney in the execution chamber at the Oklahoma State Penitentiary is pictured in McAlester, Okla. (AP Photo, File)

The U.S. Supreme Court is reviewing the state's three-drug method in a case sparked by a botched lethal injection last spring.

Rep. Mike Christian of Oklahoma City says using nitrogen gas to cut off an inmate's supply of oxygen would be a low-cost, foolproof method of execution.

An analysis of the bill projects a $300,000 cost to build a gas chamber.

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