The US Department of Justice (DOJ) filed suit against California on Thursday, seeking to prevent the state from enforcing its own emission standards for heavy trucks. The suit came three days after major manufacturers, including Daimler and Volvo, filed a related complaint against the California Air Resources Board (CARB), stating that they were “caught in a crossfire between two sovereigns who are openly hostile to one another.”

The new complaint is one of several related filings. On August 13, the American Free Enterprise Chamber of Commerce filed a memorandum against Steven Cliff, the executive officer of the CARB, in support of the DOJ’s suit. A connected complaint seeks declaratory and injunctive relief against Cliff, saying, “Defendant Cliff’s ongoing defiance of federal con

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