President Trump may be quitting the Paris accord on climate change — but forcing the rest of the nation to go along with him is proving more of a challenge.

Led by California, dozens of states and cities across the country responded Friday to Trump’s attack on the worldwide agreement by vowing to fulfill the U.S. commitment without Washington — a goal that is not out of reach.

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It is threatening to block California from implementing aggressive new fuel mileage standards. If the White House successfully follows through, that could jeopardize the ability of states and cities to meet the Paris climate action commitments, according to Michael Wara, a professor of energy law at Stanford University.

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Wara said natural gas prices had dropped so low that most states would probably meet the targets the Obama administration set for them through the Clean Power Plan — the signature federal climate action Trump has ordered dismantled.