The Republican-led Senate moved Wednesday to overturn key Biden-era waivers allowing California to set its own vehicle emissions, a major blow to that state’s effort to regulate pollution from cars and trucks that could have broad environmental impacts for the rest of the country.

GOP leaders insist they aren't trying to end the 60-vote rule. Democrats warned that by ignoring the parliamentarian in this case, they are "going nuclear" on the filibuster.

The US Senate voted today to strip California of its authority to enact state limits on tailpipe pollution that are tougher than national standards. Opponents called it an illegal move by Republican lawmakers that flies in the face of Senate rules and norms.