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 has overruled the guidance of the parliamentarian, a nonpartisan staffer who interprets the Senate's rules, and voted 51 to 44 to overturn a waiver allowing California to set its own air po...

California Gov. Gavin Newsom and state air regulators say what lawmakers are doing is illegal and they will likely sue if the measure advances.