.Biden readying to block out Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel claims it could leave behind Pittsburgh if Nippon bargain fails as Biden intends to block takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York City TimesExclusive|USA Steel Portend Plant Closings if Sale Collapses The Exchange JournalBiden prepped to shut out United States Steel acquisition through Nippon Steel CNN.