For a crop of ambitious Democrats, the shroud of secrecy surrounding former President Joe Biden’s health has become an opportunity to break with party leadership. In recent days, a small chorus of Democrats has been litigating the wisdom of Biden running for a second term,

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.