.Biden readying to block out Nippon Steel purchase of USA Steel The Washington PostU.S. Steel claims it might leave behind Pittsburgh if Nippon deal fails as Biden prepares to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The The Big Apple TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Breaks Down The Commercial JournalBiden prepped to block United States Steel purchase by Nippon Steel CNN.