.Biden readying to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel mentions it might leave Pittsburgh if Nippon bargain falls through as Biden organizes 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 Sale Collapses The Commercial JournalBiden prepared to block out United States Steel investment through Nippon Steel CNN.