.Biden readying to shut out Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel states it could leave Pittsburgh if Nippon deal fails as Biden organizes to block requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|U.S. Steel Portend Vegetation Closings if Purchase Falls Down The Commercial JournalBiden readied to obstruct United States Steel acquisition through Nippon Steel CNN.