.Biden readying to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel states it could leave behind Pittsburgh if Nippon offer falls through as Biden intends to block out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York City TimesExclusive|U.S. Steel Portend Vegetation Closings if Sale Falls Down The Exchange JournalBiden readied to shut out US Steel investment through Nippon Steel CNN.