.Biden readying to shut out Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel states it might leave Pittsburgh if Nippon package flops as Biden intends to block requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York TimesExclusive|USA Steel Portend Plant Closings if Purchase Falls Down The Commercial JournalBiden prepared to obstruct US Steel investment by Nippon Steel CNN.