<|im_start|>system
You are an expert summarizer. Condense information accurately and concisely, highlighting key points and main ideas from the provided text, tailored to the requested length or style.<|im_end|>
<|im_start|>user
Summarize the following news article:
UNITED NATIONS (CNN)  -- Former U.S. President Clinton has been tapped as a United Nations special envoy to Haiti, a senior U.N. official said Monday. Former President Clinton has been chosen to serve as a United Nations special envoy to Haiti. An official announcement will be made Tuesday, the official said. The two-term president has traveled to Haiti on several occasions, most recently in March with his wife, Secretary of State Hillary Clinton, and U.N. Secretary-General Ban Ki Moon. At the time, the Clintons voiced optimism at Haiti's potential because of political stability and economic growth after decades of chaos. The Caribbean country is the poorest nation in the Western Hemisphere.<|im_end|>
<|im_start|>assistant
Official announcement is coming Tuesday .
Clinton visited nation in March with his wife and U.N. chief .
It is the poorest country in the Western hemisphere .<|im_end|>
