.Biden readying to obstruct Nippon Steel investment of USA Steel The Washington PostU.S. Steel states it might leave Pittsburgh if Nippon bargain flops as Biden plans to block out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Collapses The Wall Street JournalBiden prepped to block US Steel acquisition by Nippon Steel CNN.