.Biden readying to block Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel says it can leave behind Pittsburgh if Nippon deal fails as Biden prepares to block takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York City TimesExclusive|U.S. Steel Portend Vegetation Closings if Purchase Falls Down The Stock market JournalBiden prepared to block out United States Steel purchase by Nippon Steel CNN.