.Biden readying to block Nippon Steel purchase of united state Steel The Washington PostU.S. Steel says it could possibly leave behind Pittsburgh if Nippon deal falls through as Biden plans to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The The Big Apple TimesExclusive|United State Steel Warns of Plant Closings if Sale Collapses The Wall Street JournalBiden readied to block US Steel purchase through Nippon Steel CNN.