.Biden prepping to block out Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel states it can leave behind Pittsburgh if Nippon bargain fails as Biden organizes to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The Nyc TimesExclusive|U.S. Steel Portend Plant Closings if Purchase Breaks Down The Commercial JournalBiden readied to shut out US Steel acquisition through Nippon Steel CNN.