.Biden readying to obstruct Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel mentions it could possibly leave Pittsburgh if Nippon deal fails as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The New York TimesExclusive|United State Steel Portend Vegetation Closings if Sale Collapses The Exchange JournalBiden prepped to block out US Steel investment through Nippon Steel CNN.