.Biden prepping to block Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel claims it could possibly leave behind Pittsburgh if Nippon offer flops as Biden prepares to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The Nyc TimesExclusive|USA Steel Warns of Plant Closings if Sale Breaks Down The Stock market JournalBiden readied to shut out US Steel purchase through Nippon Steel CNN.