.Biden preparing to shut out Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel states it could possibly leave Pittsburgh if Nippon deal fails as Biden prepares to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Falls Down The Stock market JournalBiden prepared to block US Steel acquisition through Nippon Steel CNN.