.Biden preparing to block Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel mentions it could leave behind Pittsburgh if Nippon deal flops as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The The Big Apple TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Collapses The Wall Street JournalBiden prepped to block out US Steel purchase by Nippon Steel CNN.