.Biden preparing to shut out Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel states it can leave behind Pittsburgh if Nippon bargain falls through as Biden organizes to block out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York City TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Collapses The Exchange JournalBiden prepped to block United States Steel purchase by Nippon Steel CNN.