.Biden preparing to block Nippon Steel investment of USA Steel The Washington PostU.S. Steel says it can leave behind Pittsburgh if Nippon bargain falls through as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York City TimesExclusive|USA Steel Warns of Vegetation Closings if Sale Breaks Down The Exchange JournalBiden prepared to shut out US Steel purchase through Nippon Steel CNN.