.Biden preparing to obstruct Nippon Steel investment of united state Steel The Washington PostU.S. Steel states it can leave behind Pittsburgh if Nippon bargain flops as Biden organizes to block requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The Nyc TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Collapses The Commercial JournalBiden prepped to obstruct US Steel purchase through Nippon Steel CNN.