.Biden readying to block Nippon Steel purchase of united state Steel The Washington PostU.S. Steel mentions it could possibly leave Pittsburgh if Nippon deal fails as Biden prepares to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The The Big Apple TimesExclusive|United State Steel Warns of Vegetation Closings if Sale Falls Down The Wall Street JournalBiden prepared to shut out US Steel investment through Nippon Steel CNN.