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WASHINGTON — The Trump administration is set to roll back the centerpiece of President Barack Obama’s efforts to slow global warming, the Clean Power Plan that restricts greenhouse gas emissions from coal-fired power plants.

A plan to be announced in coming days would give states broad authority to determine how to restrict carbon dioxide and other greenhouse gas emissions that contribute to global warming. The Environmental Protect Agency announced late Monday that acting administrator Andrew Wheeler planned to brief the news media by telephone Tuesday on greenhouse guidelines for states to set performance standards for existing coal-fired power plants.

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President Donald Trump is expected to promote the new plan at an appearance in West Virginia on Tuesday.

The plan also would let states relax pollution rules for power plants that need upgrades, according to a summary of the plan and several people familiar with the full proposal who spoke to The Associated Press on condition of anonymity because they weren’t authorized to discuss the plan publicly.