.Biden prepping to block out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel claims it might leave Pittsburgh if Nippon deal fails as Biden organizes to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The The Big Apple TimesExclusive|United State Steel Warns of Plant Closings if Sale Breaks Down The Wall Street JournalBiden prepared to block United States Steel acquisition through Nippon Steel CNN.