.Biden readying to block out Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel claims it can leave Pittsburgh if Nippon package falls through as Biden considers to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The Nyc TimesExclusive|USA Steel Warns of Plant Closings if Sale Collapses The Stock market JournalBiden prepared to obstruct United States Steel acquisition by Nippon Steel CNN.