.Biden readying to obstruct Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel mentions it can leave behind Pittsburgh if Nippon package fails as Biden prepares to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The Nyc TimesExclusive|U.S. Steel Portend Plant Closings if Sale Breaks Down The Stock market JournalBiden prepped to obstruct United States Steel investment through Nippon Steel CNN.