.Biden preparing to obstruct Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel claims it can leave behind Pittsburgh if Nippon offer flops as Biden intends to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York TimesExclusive|USA Steel Warns of Vegetation Closings if Purchase Breaks Down The Commercial JournalBiden prepped to block United States Steel acquisition through Nippon Steel CNN.