In September 1998, Clark led a delegation to Sudan to collect evidence in the aftermath of President Bill Clinton's bombing of the Al-Shifa pharmaceutical factory in Khartoum the previous month as part of Operation Infinite Reach. Upon returning to the U.S., the delegation held a press conference on September 22, 1998, to refute the U.S. State Department's claims that the facility had been producing VX nerve agent. U.S. officials later acknowledged that the evidence cited as the rationale for the Al-Shifa strike was weaker than initially believed.