.Biden prepping to obstruct Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel states it can leave behind Pittsburgh if Nippon deal fails as Biden prepares to block takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|United State Steel Portend Vegetation Closings if Sale Breaks Down The Commercial JournalBiden readied to block out US Steel investment by Nippon Steel CNN.