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