.Biden prepping to obstruct Nippon Steel investment of USA Steel The Washington PostU.S. Steel mentions it might leave behind Pittsburgh if Nippon bargain flops as Biden organizes to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York TimesExclusive|USA Steel Portend Plant Closings if Purchase Falls Down The Stock market JournalBiden readied to obstruct United States Steel investment by Nippon Steel CNN.