.Biden readying to block out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel says it can leave behind Pittsburgh if Nippon offer falls through as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|United State Steel Warns of Plant Closings if Purchase Breaks Down The Wall Street JournalBiden prepared to block out United States Steel purchase through Nippon Steel CNN.