.Biden readying to block out Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel states it could possibly leave behind Pittsburgh if Nippon bargain flops as Biden considers to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|USA Steel Portend Plant Closings if Purchase Breaks Down The Commercial JournalBiden readied to obstruct United States Steel acquisition by Nippon Steel CNN.