.Biden readying to shut out Nippon Steel purchase of united state Steel The Washington PostU.S. Steel claims it might leave behind Pittsburgh if Nippon deal flops as Biden considers to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York TimesExclusive|United State Steel Portend Plant Closings if Sale Falls Down The Exchange JournalBiden prepped to obstruct United States Steel purchase by Nippon Steel CNN.