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 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.

The U.S. Senate on Thursday voted to bar California's landmark plan to end the sale of gasoline-only vehicles by 2035 that has been adopted by 11 other states representing a third of the U.S. auto market.