.Biden preparing to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel claims it can leave behind Pittsburgh if Nippon bargain falls through as Biden plans to block out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The Nyc TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Falls Down The Wall Street JournalBiden prepared to shut out United States Steel acquisition through Nippon Steel CNN.