.Biden preparing to block out Nippon Steel purchase of USA Steel The Washington PostU.S. Steel states it could leave Pittsburgh if Nippon package falls through as Biden intends to block requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York TimesExclusive|U.S. Steel Warns of Vegetation Closings if Purchase Breaks Down The Wall Street JournalBiden readied to shut out United States Steel investment by Nippon Steel CNN.