.Biden prepping to shut out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel says it can leave Pittsburgh if Nippon package flops as Biden organizes to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York City TimesExclusive|United State Steel Warns of Vegetation Closings if Sale Falls Down The Wall Street JournalBiden prepared to block out US Steel investment by Nippon Steel CNN.