.Biden preparing to block Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel mentions it could leave Pittsburgh if Nippon package falls through as Biden intends to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The The Big Apple TimesExclusive|United State Steel Portend Plant Closings if Purchase Falls Down The Stock market JournalBiden prepped to shut out United States Steel investment through Nippon Steel CNN.