.Biden readying to block out Nippon Steel purchase of USA Steel The Washington PostU.S. Steel says it might leave behind Pittsburgh if Nippon deal falls through as Biden plans to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|U.S. Steel Warns of Vegetation Closings if Purchase Breaks Down The Stock market JournalBiden prepared to block out United States Steel acquisition through Nippon Steel CNN.