.Biden prepping to block out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel claims it can leave behind Pittsburgh if Nippon offer fails as Biden considers to block out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|USA Steel Portend Plant Closings if Purchase Collapses The Stock market JournalBiden prepped to obstruct United States Steel investment through Nippon Steel CNN.