.Biden readying to obstruct Nippon Steel investment of USA Steel The Washington PostU.S. Steel says it might leave behind Pittsburgh if Nippon deal fails as Biden organizes to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|USA Steel Portend Vegetation Closings if Purchase Collapses The Commercial JournalBiden readied to block out US Steel investment through Nippon Steel CNN.