.Biden prepping to obstruct Nippon Steel purchase of USA Steel The Washington PostU.S. Steel says it could leave Pittsburgh if Nippon bargain fails as Biden prepares to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The The Big Apple TimesExclusive|USA Steel Warns of Vegetation Closings if Purchase Collapses The Exchange JournalBiden readied to block United States Steel acquisition by Nippon Steel CNN.