Bill Clinton will be named special UN envoy to Haiti, the former president's spokesman Matt McKenna said Monday. AN official announcement was expected Tuesday from UN Secretary-General Ban Ki-Moon, he added. Clinton is popular among many of Haiti's poor because as president in 1994, he used the threat of military force to oust a dictatorship in the Caribbean nation. US Army troops and Marines then quickly arrived to pave the way for the return of elected President Jean-Bertrand Aristide, who had been ousted in a coup. Haiti is the Western hemisphere's poorest country and has been mired in political and social turmoil for decades.