Attorneys for automakers have joined forces with the Trump Administration as they begin the cumbersome task of working to scuttle what would have been some of America’s most far-reaching rules designed to slow global warming — ambitious car mileage standards.

Trump announced in Michigan on Wednesday that the EPA would review federal mileage standards for 2022 to 2025. The Alliance of Automobile Manufacturers filed a lawsuit this week challenging the same standards, several weeks after it asked EPA to conduct the review.

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This is an enormously significant set of standards,” said Michael Wara, an energy and environment expert at Stanford Law School. “The fuel economy standards are the single biggest step the Obama administration took to reduce greenhouse gas emissions in the U.S.”