.Biden preparing to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel claims it could leave Pittsburgh if Nippon bargain falls through as Biden prepares to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York TimesExclusive|U.S. Steel Portend Plant Closings if Purchase Collapses The Exchange JournalBiden readied to obstruct United States Steel acquisition through Nippon Steel CNN.