.Biden readying to shut out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel mentions it might leave behind Pittsburgh if Nippon offer falls through as Biden organizes to block takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York TimesExclusive|USA Steel Warns of Vegetation Closings if Purchase Collapses The Commercial JournalBiden readied to block out United States Steel investment by Nippon Steel CNN.