.Biden preparing to obstruct Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel says it might leave Pittsburgh if Nippon package fails as Biden plans to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|United State Steel Portend Vegetation Closings if Sale Falls Down The Stock market JournalBiden prepped to obstruct US Steel investment through Nippon Steel CNN.