HARARE (Reuters) - President Robert Mugabe told the U.S. ambassador to Zimbabwe to "go to hell" on Tuesday, after the envoy blamed the country's economic and political crisis on mismanagement and corrupt rule.

State media said the ambassador, Christopher Dell, risked expulsion from the southern African country for his "undiplomatic" criticism of the government in a public lecture.

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But Mugabe says he has been targeted by foreign opponents led by Zimbabwe's former colonial ruler Britain for his nationalistic policies and says most of Africa is on his side in which he describes as a struggle against imperialism.