.Biden preparing to block Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel claims it can leave Pittsburgh if Nippon package fails as Biden considers to block out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|USA Steel Portend Vegetation Closings if Sale Collapses The Wall Street JournalBiden prepped to shut out United States Steel acquisition through Nippon Steel CNN.