.Biden preparing to shut out Nippon Steel investment of united state Steel The Washington PostU.S. Steel claims it can leave behind Pittsburgh if Nippon bargain fails as Biden organizes to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The Nyc TimesExclusive|U.S. Steel Warns of Plant Closings if Purchase Collapses The Commercial JournalBiden prepared to block out United States Steel investment through Nippon Steel CNN.