The first big issue to face President-elect Trump’s Environmental Protection Agency will not be rolling back climate change regulations, but rather a proposal by the refinery industry looking to upend the agency’s renewable fuel program.

Some refiners want to change the Renewable Fuel Standard so that they are no longer on the hook for complying with the standard, which requires refiners to blend primarily corn-based ethanol and other renewable fuels into the nation’s gasoline and diesel supplies.