.Biden readying to shut out Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel claims it could leave behind Pittsburgh if Nippon bargain falls through as Biden organizes to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|U.S. Steel Warns of Plant Closings if Purchase Falls Down The Stock market JournalBiden readied to obstruct United States Steel purchase through Nippon Steel CNN.