.Biden preparing to shut out Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel states it might leave behind Pittsburgh if Nippon package fails as Biden intends to block out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|USA Steel Warns of Vegetation Closings if Purchase Breaks Down The Stock market JournalBiden prepared to block out US Steel investment by Nippon Steel CNN.