The Trump administration is expected to start rolling back tough limits on carbon pollution from cars and trucks this week, and may be considering a plan to revoke California’s authority to set its own pollution standards for vehicles, a linchpin of the state’s effort to battle climate change.

Environmental Protection Agency chief Scott Pruitt is pushing the move to weaken emissions standards, siding with auto manufacturers that argue vehicle fuel efficiency standards put in place by the Obama administration will cost billions of dollars. On Thursday, he said he would move “very, very soon” to roll them back.

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“If you look at what California has done to control greenhouse gas emissions, the tailpipe rule has done the largest amount of work,” said Michael Wara, a Stanford University professor of environmental law. “So California is going to fight, to deploy every resource it has, to keep this stuff, because this is big.”