.Biden readying to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel claims it can leave behind Pittsburgh if Nippon deal fails as Biden intends to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York City TimesExclusive|USA Steel Portend Plant Closings if Purchase Collapses The Exchange JournalBiden prepared to shut out United States Steel acquisition through Nippon Steel CNN.