.Biden preparing to obstruct Nippon Steel purchase of united state Steel The Washington PostU.S. Steel claims it could leave behind Pittsburgh if Nippon bargain fails as Biden prepares to block out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The Nyc TimesExclusive|United State Steel Warns of Vegetation Closings if Sale Collapses The Stock market JournalBiden readied to shut out US Steel acquisition through Nippon Steel CNN.