.Biden readying to block Nippon Steel investment of USA Steel The Washington PostU.S. Steel states it could possibly leave behind Pittsburgh if Nippon package falls through as Biden intends to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The The Big Apple TimesExclusive|USA Steel Warns of Plant Closings if Purchase Breaks Down The Exchange JournalBiden prepped to block United States Steel purchase by Nippon Steel CNN.