Washington, AU step up mediation efforts to resolve Nile dispute US Special Envoy for the Horn of Africa Jeffrey Feltman is beginning an African tour that will take him to Egypt, Eritrea, Ethiopia and Sudan from May 4 to May 13. Tuesday 04/05/2021 A 2017 file picture of US Special Envoy to Horn of Africa Jeffrey Feltman. (AFP) CAIRO--US Special Envoy for the Horn of Africa Jeffrey Feltman is beginning an African tour that will take him to Egypt, Eritrea, Ethiopia and Sudan from May 4 to May 13, the US Department of State announced on Monday. Feltman is one of the international brokers of negotiations between Egypt, Sudan and Ethiopia over the Grand Ethiopian Renaissance Dam (GERD). The talks are mediated by the African Union, the United Nations and the US.