.Biden readying to block out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon bargain falls through as Biden prepares to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The The Big Apple TimesExclusive|U.S. Steel Portend Vegetation Closings if Sale Breaks Down The Exchange JournalBiden prepped to block US Steel investment through Nippon Steel CNN.