Oklahoma lawmakers are moving to ban local courts from considering Shariah or other international law in their rulings.

The unusual measure calling for an amendment to the Oklahoma Constitution was approved in late May by the state Senate, sending the issue to voters in the fall in the form of a ballot question, Fox News reported Tuesday.

Though the question's supporters have not pointed to any specific outbreak of Shariah, or Islamic law, being considered in the U.S. judicial system, they describe it as an encroaching threat. State Rep. Rex Duncan, author of the measure, has called the ballot question a "preemptive strike" against Shariah coming to his state.

Duncan said in a statement after the vote that he hopes other states will soon follow Oklahoma's lead.

"Judges in other states and on the federal bench have increasingly turned to citing international law in their court decisions, something I and others feel is grossly inappropriate in a sovereign state such as our own," he said.

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