.Biden preparing to block Nippon Steel investment of USA Steel The Washington PostU.S. Steel says it could possibly leave Pittsburgh if Nippon deal falls through as Biden organizes to block takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York City TimesExclusive|U.S. Steel Warns of Plant Closings if Sale Falls Down The Wall Street JournalBiden prepped to block out United States Steel purchase by Nippon Steel CNN.