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Prime Minister Stephen Harper is co-chair of a UN commission formed to ensure delivery of roughly $40 billion pledged to a mother-and-child health fund. The ambitious program comes on the heels of an audit of a global aid fund that found millions of dollars may have been misused. 

Stephen Lewis, a former UN envoy for HIV and AIDS in Africa, spoke to CBC News on Wednesday from New York about the issues of maternal health, accountability and transparency.