.Biden preparing to obstruct Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel claims it might leave Pittsburgh if Nippon deal falls through as Biden intends to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York City TimesExclusive|USA Steel Warns of Plant Closings if Purchase Breaks Down The Stock market JournalBiden readied to shut out United States Steel acquisition by Nippon Steel CNN.