.Biden readying to obstruct Nippon Steel investment of USA Steel The Washington PostU.S. Steel says it might leave Pittsburgh if Nippon deal falls through as Biden considers to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York TimesExclusive|United State Steel Portend Plant Closings if Sale Falls Down The Commercial JournalBiden prepped to shut out US Steel purchase by Nippon Steel CNN.