The Trump administration on Wednesday, Oct. 23, sued California for entering a program to cut fossil fuel emissions with a Canadian province, saying the state bypassed federal power to conduct foreign policy.

“The state of California has veered outside of its proper constitutional lane to enter into an international emissions agreement. The power to enter into such agreements is reserved to the federal government, which must be able to speak with one voice in the area of U.S. foreign policy,” Assistant Attorney General Jeffrey Bossert Clark said in a statement.

The complaint, filed in California federal court, names Democratic Gov. Gavin Newsom and others. It said the state entered a complex cap-and-trade emissions-curbing climate program with Quebec without congressional approval.

President Trump, who questions the science behind climate change, has revived the oil, gas, and coal industries of the country and pulled the United States out of the 2015 Paris climate accord. In September, the Trump administration said it would revoke California’s authority to set strict car pollution rules.

“The White House is yet again continuing its political vendetta against California, our climate policies, and the health of our communities,” Newsom said in a statement in response to Wednesday’s suit.

On Tuesday, Newsom complained about the high cost of gas in his state and threatened possible legal action against oil companies while totally ignoring California’s more stringent environmental regulations and its gas taxes, which outstrip the other 49 states, according to the Daily Caller.

“CA drivers have paid an average of 30 cents more per gallon. There’s no identifiable evidence to justify that. I’m demanding an investigation. If oil companies are engaging in false advertising or price fixing—legal action should be taken,” Newsom tweeted.