Missouri is joining 19 other states in suing the Environmental Protection Agency for backing a California law that will phase out most gas-powered trucks by 2045.

Missouri Attorney General Andrew Bailey announced Monday that his is the 20th state to challenge the EPA’s decision to allow California to phase out medium- and heavy-duty, gas-powered vehicles while phasing in electric vehicles. 

Bailey's office described the law as an illegal ban.

"I will always fight to protect Missouri businesses, and that includes the trucking community that is vital to the success of our state," Bailey said in a statement. "Joe Biden is partnering with California to attempt to upend Missouri’s economy through the federal administrative state, and my office isn’t going to stand for it."

Andrew Bailey

Andrew Bailey, Missouri's attorney general, speaks to members of the media following oral arguments outside the U.S. Supreme Court in Washington, D.C., US, on Tuesday, Feb. 28, 2023. (Photographer: Valerie Plesch/Bloomberg via Getty Images)

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EPA Administrator Michael Regan announced in March that his agency had reinstated California’s authority under the Clean Air Act to implement its own emission standards and zero-emission vehicle sales mandate.

California’s new rules require truck manufacturers to increase sales of zero-emission trucks, buses and vans each year while decreasing gas-powered vehicles on the road.

Environmental Protection Agency Administrator Michael Regan

U.S. Environmental Protection Agency Administrator Michael Regan prepares to testify before the Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies in the Dirksen Senate Office Building on Capitol Hill on May 3, 2023 in Washington, D.C. (Photo by Chip Somodevilla/Getty Images)

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Other states can choose to adopt California’s version of the rules, and a handful of blue states have done just that, including New York and Washington state.

Bailey’s office said the EPA decision will eventually "regulate the current trucking industry out of existence."

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"Currently, just 2% of heavy trucks sold in the United States are electric," his office said in a press release.

The lawsuit was filed on June 5 in the U.S. Court of Appeals of the District of Columbia by Iowa Attorney General Brenna Bird, who is joined by Bailey and the attorneys general of Alabama, Arkansas, Georgia, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Montana, Nebraska, North Dakota, Ohio, Oklahoma, South Carolina, Utah, West Virginia, and Wyoming.

Iowa Attorney General Brenna Bird

Iowa Attorney General Brenna Bird waves to the crowd during the Iowa Faith and Freedom Coalition's Road to Victory Conference at the Horizon Events Center in Clive, Iowa, on April 22, 2023. (Photo by RACHEL MUMMEY/AFP via Getty Images)