BOSTON (AP) — Massachusetts Attorney General Maura Healey is pledging to sue the Trump administration over its move to kill an Obama-era effort to limit carbon emissions from coal-fired power plants.

Healey, a Democrat, said the decision violates the law and imperils the future of the planet.

Environmental Protection Agency Administrator Scott Pruitt said Monday he would be issuing a new set of rules overriding the Clean Power Plan, the centerpiece of President Barack Obama's drive to curb global climate change.

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Healey said it's "essential that the EPA address our country's largest source of carbon pollution — existing fossil fuel-burning power plants — to mitigate climate change."

She said Massachusetts fought for years to help put the rule in place.

Healey said Massachusetts, with its partners, will be suing to protect the plan.