.Biden readying to block Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel states it could leave behind Pittsburgh if Nippon package flops as Biden plans to block out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York City TimesExclusive|United State Steel Portend Plant Closings if Sale Falls Down The Wall Street JournalBiden prepped to shut out United States Steel acquisition through Nippon Steel CNN.