.Biden preparing to block out Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel states it could possibly leave Pittsburgh if Nippon deal falls through as Biden intends to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|U.S. Steel Portend Plant Closings if Purchase Breaks Down The Commercial JournalBiden readied to block US Steel acquisition by Nippon Steel CNN.