In a major showdown between states and the federal government, Hawaii joined a coalition of nearly two dozen others states Friday in a dispute over clean car standards.

The Trump administration moved this week to revoke California’s authority to set its own vehicle emissions standards, “first granted under former President Obama,” The Hill reported.

The lawsuit was filed by California’s Attorney General Xavier Becerra, a Democrat, along with the attorneys general of 23 other states and leaders of Washington, D.C.; Los Angeles and New York City.

Flickr: Heather Harvey

The lawsuit argues that the administration “unlawfully removed the state’s waiver granted under the Clean Air Act.”

The suit also alleges that “the decision to remove California’s waiver to set its own standards, which are currently adopted by 12 other states, exceeds the National Highway Traffic Safety Administration’s authority. NHTSA, under the Department of Transportation, and the Environmental Protection Agency jointly drafted the new emissions rule,” The Hill explained.

Hawaii Attorney General Clare Connors said in a press release Friday, “The NHTSA does not have the authority to preempt California’s standards related to vehicle emissions and pollutants. This attack on California’s efforts hurts every state that is trying to protect its communities from pollution and environmental harm.”

The other attorneys general represent Colorado, Connecticut, Delaware, Illinois, Maine, Massachusetts, Maryland, Michigan, Minnesota, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, Washington, Wisconsin, and the District of Columbia.

The New York Times reported the reasons for the administration’s action.

“The Trump administration is revoking California’s Federal Waiver on emissions in order to produce far less expensive cars for the consumer, while at the same time making the cars substantially SAFER,” Trump wrote in the first of three Twitter posts. “He said the change would lead to increased auto production and new ‘JOBS, JOBS JOBS,’ and claimed that the newer cars would be ‘extremely environmentally friendly.'”