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 Senate voted 51-44 to overturn California’s electric-vehicle mandate via the Congressional Review Act on Thursday, defying the Government Accountability Office and the Senate parliamentarian. Elizabeth MacDonough,