Republicans gird for battle and businesses brace for details of Biden’s new vaccine rule

The emergency ruling could impact tens of millions of workers, and the White House believes it will help the U.S. emerge from the pandemic.

President Biden’s planned vaccine requirement faces a number of tests in coming weeks, as at least two dozen Republican-controlled states prepare legal challenges, setting up a clash between the federal government and local officials that could ultimately determine the fate of the rule.

The Labor Department has moved slowly in designing the rule, which White House officials said will require companies with more than 100 employees...