Updated

The Environmental Protection Agency hasn't made available key data used to craft its twin proposals to reduce carbon emissions from new and existing power plants, 13 Republican attorneys general said.

The attorneys general charge that the EPA is violating federal law by not disclosing the information, which they said makes it difficult for states and the public to ascertain how the agency developed its proposals.

"Without such missing data and related materials, states and the public cannot properly determine the basis on which EPA claims that these emissions standards are achievable and reasonable," said the attorneys general, led by West Virginia's Patrick Morrisey, in a Monday letter to EPA Administrator Gina McCarthy.

Republicans in Congress and governors' mansions across the country have sought to stop, or at least weaken, the proposed rules. They, with allies in the business community, say the regulations would raise energy prices and restrain economic activity.

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