.Biden preparing to block Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel claims it might leave behind Pittsburgh if Nippon deal falls through as Biden prepares to block out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The The Big Apple TimesExclusive|USA Steel Warns of Vegetation Closings if Sale Falls Down The Commercial JournalBiden readied to block US Steel investment through Nippon Steel CNN.