.Biden prepping to obstruct Nippon Steel purchase of united state Steel The Washington PostU.S. Steel claims it could possibly leave behind Pittsburgh if Nippon deal fails as Biden plans to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The The Big Apple TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Breaks Down The Commercial JournalBiden prepared to shut out United States Steel purchase by Nippon Steel CNN.