.Biden preparing to shut out Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel claims it might leave Pittsburgh if Nippon offer fails as Biden plans to block takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York City TimesExclusive|United State Steel Warns of Plant Closings if Purchase Breaks Down The Stock market JournalBiden prepped to block US Steel purchase by Nippon Steel CNN.