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 California Clean Air Act waivers aim to implement a stringent electric vehicle mandate that would affect the whole country.