.Biden readying to shut out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel states it could leave behind Pittsburgh if Nippon package fails as Biden organizes to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|USA Steel Portend Vegetation Closings if Purchase Breaks Down The Commercial JournalBiden readied to block US Steel purchase by Nippon Steel CNN.