.Biden readying to block out Nippon Steel investment of united state Steel The Washington PostU.S. Steel states it could leave behind Pittsburgh if Nippon deal fails as Biden organizes to block takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The The Big Apple TimesExclusive|U.S. Steel Portend Plant Closings if Sale Breaks Down The Wall Street JournalBiden readied to block US Steel acquisition by Nippon Steel CNN.