West Virginia’s U.S. Senators are pushing back on the Biden administration’s effort to cut greenhouse gas emissions from cars and trucks.

Sens. Joe Manchin and Shelley Moore Capito have co-sponsored a resolution to overturn a Federal Highway Administration rule on emissions targets.

The rule, made final in November, requires state departments of transportation and metropolitan planning organizations to set declining emissions targets.

Both Capito and Manchin argue the agency lacks the authority from Congress to issue such a requirement.

The rule itself, though, does not specify how low the targets have to be, as long as they’re declining, and does not impose penalties on states for not meeting them.

The House of Representatives has a similar bill to overturn the rule.