.Biden preparing to obstruct Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon offer falls through as Biden intends to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York City TimesExclusive|USA Steel Warns of Vegetation Closings if Sale Breaks Down The Stock market JournalBiden prepped to block US Steel purchase through Nippon Steel CNN.