.Biden preparing to shut out Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel says it could possibly leave behind Pittsburgh if Nippon package fails as Biden intends to block takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York TimesExclusive|United State Steel Portend Vegetation Closings if Sale Breaks Down The Stock market JournalBiden prepped to block United States Steel purchase through Nippon Steel CNN.