.Biden readying to block Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel mentions it could leave behind Pittsburgh if Nippon package fails as Biden considers to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|USA Steel Portend Vegetation Closings if Sale Breaks Down The Wall Street JournalBiden prepped to block out US Steel acquisition through Nippon Steel CNN.