A new report says that the Trump administration is looking for new ways to reduce fuel economy standards for the future, reversing targets set under President Obama.

A new draft analysis, obtained by Bloomberg, shows that the National Highway Trafic Safety Administration is looking at options that would lower future fleetwide fuel economy targets. One of those scenarios would lower the target by more than 10 miles per gallon.

Under the fuel economy rules set during the Obama administration, automakers are required to hit a 46.6 mpg target by 2026. That target expected that 61 percent of new cars and light trucks would need to be hybrid or plug-in electric by 2030. The new agency projection sets that at just 10 percent by 2030, and would lower the 2026 fuel economy fleet goal to just 35.7 mpg. 2017 hybrid and electric vehicle sales hit 3.2 percent of overall sales.

According to Bloomberg, the document suggests other alternatives to the NHTSA fuel economy standards, including cuts that were less aggressive. The agency didn’t specify a preferred scenario. The draft also suggested that NHTSA may make changes to the standards as soon as 2021, or as far out as 2026, which gives automakers more time to improve fleet fuel economy.

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It also gives a look into negotiations between the NHTSA, EPA, and California regulators. The new proposal could cause a clash between the Trump administration and the California Air Resource Board, which has said that it will defend its own standards for efficiency. A break between the two would be bad for automakers who could then be forced to once again meet differing emission regulations in different states.

A spokesperson for CARB said that the agency won’t comment on possible changes until it has received them from the Trump administration.

Spokesman Stanley Young did say that “It’s clear that in order to stay competitive globally, the U.S. auto industry needs to keep pace with the rest of the world. That’s where California is moving. It is unwise for the federal government to set the clock of automotive technology back a decade.”

Automakers have lobbied for an easing of fuel economy targets, saying that increasing sales of trucks and crossovers have combined with low gas prices to lead to lower demand for electric vehicles.