.Biden readying to block out Nippon Steel investment of USA Steel The Washington PostU.S. Steel mentions it could possibly leave behind Pittsburgh if Nippon deal falls through as Biden organizes to block requisition 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 prepared to shut out US Steel investment by Nippon Steel CNN.