.Biden preparing to block out Nippon Steel investment of united state Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon deal flops as Biden prepares to block takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York City TimesExclusive|United State Steel Portend Vegetation Closings if Sale Collapses The Stock market JournalBiden prepared to block United States Steel acquisition through Nippon Steel CNN.