.Biden readying to obstruct Nippon Steel investment of united state Steel The Washington PostU.S. Steel says it can leave behind Pittsburgh if Nippon bargain flops as Biden considers to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|USA Steel Portend Plant Closings if Purchase Falls Down The Stock market JournalBiden prepped to shut out United States Steel purchase by Nippon Steel CNN.