An ambassador was a government-appointed official who legally represented their country within a foreign nation.
During Day 2, Ambassador Shareef visited from one of the three Middle Eastern countries which were framed for supporting the Second Wave terrorists by the fabricated Cyprus recording. He succeeded in negotiating for a sharing of secret intelligence with President David Palmer, to assist America. Shareef and his assistant Farhad Salim were subsequently murdered when their helicopter was destroyed by elements loyal to the moles Roger Stanton, Bruce Gluck, and Ron Samuels, who all were running their own illegal undercover operation to wipe out Second Wave.
During Day 10, Hammad was the ambassador from Jordan to the United States. Hammad agreed to let Ara Naseri, daughter of notorious terrorist Asim Naseri, into the Jordanian Embassy. He also contacted Ara's mother, who agreed to travel to the U.S. and take custody of the girl. ("Day 10: 11:00pm-12:00pm")