Biden's new vaccine requirement has Republicans ready with lawsuits, while business groups seek more details

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 to institute mandatory vaccination or testing protocols for their staffs. Top administration officials have been working carefully to ensure the proposal is ironclad, and some have been heartened to see anecdotal evidence that companies and local governments implementing vaccine requirements have seen large-scale cooperation.