.Biden prepping to shut out Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel mentions it might leave behind Pittsburgh if Nippon bargain fails as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York City TimesExclusive|USA Steel Warns of Plant Closings if Sale Breaks Down The Commercial JournalBiden prepped to obstruct US Steel purchase by Nippon Steel CNN.