PASADENA, CA - APRIL 20:  Ret. Gen. Anthony Zinni makes a stop to discuss and sign copies of his book "The Battle for Peace" at Vroman's Bookstore on April 20, 2006 in Pasadena, California. Zinni is one of a distinguished group of retired generals calling for the resignation of Secretary of Defense Donald Rumsfeld. Rumsfeld says that calls for his resignation "will pass" and U.S. President George W. Bush has expressed confidence in Rumsfeld?s job performance.  (Photo by David McNew/Getty Images)
Retired US general Anthony Zinni has resigned as the envoy tasked with resolving the Qatar dispute. Getty

US envoys arrive in Kuwait for Qatar crisis shuttle diplomacy tour