Five U.S. states have sued the federal government over delayed gas-guzzler penalties for automakers who fail to meet fuel-economy standards.

The lawsuit has been filed by New York, California, Vermont, Maryland and Pennsylvania in the U.S. Court of Appeals in New York and expresses concerns about the Trump’s administration reluctance to implement higher gas-guzzler penalties.

Reuters asserts that in 2015, the National Highway Traffic Safety Administration proposed raising fines from $5.50 to $14 for every 0.1 mile per gallon of fuel which new vehicles consume above and beyond the Corporate Average Fuel Economy (CAFE) program.

The Trump administration ordered a review of U.S. fuel-efficiency standards for the 2022-2025 model years in March on the back of pressure from the automotive industry and could relax these standards.

In a statement discussing the lawsuit, New York Attorney General Eric Schneiderman said “State attorneys general have made clear: we won’t hesitate to act when those we serve are put at risk.”

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