H.R. McMaster, former U.S. National Security Adviser, joins Christiane Amanpour to discuss pressing foreign policy issues and his new book "Battlegrounds". He explains why Trump’s Taliban strategy is a 'disaster.' Then conservationists Beverly and Dereck Joubert talk about the devastating loss of global biodiversity and how the world might be able to recover. Our Michel Martin speaks to George Aumoithe, assistant professor of Global Health at Stony Brook University, about why there is such a shortage of ICU beds in low-income communities.

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