Oklahoma Attorney General Gentner Drummond joins twenty-two other state attorneys general in a lawsuit against the U.S. Environmental Protection Agency over a new rule that would tax methane gas.

Last year, the EPA proposed a plan to implement a new methane tax as part of the Inflation Reduction Act. The tax would compel energy producers to pay a penalty for oil and gas facilities that produce certain levels of methane. Drummond argued in the petition filed this week that the rule exceeds the EPA’s statutory authority and that it’s an unlawful abuse of discretion. Drummond called the tax a last-ditch, unlawful effort by the Biden Administration to attack the Oklahoma oil and gas industry.

Arkansas, Kansas, Missouri, and Texas are among the other other states that have joined the lawsuit.