Peter Piot, the Director of the London School of Hygiene and Tropical Medicine, joins Christiane from self-isolation in London to explain the ongoing health risks of Covid-19 and whether warmer weather could stop it's spread. Symone Sanders, a senior adviser to Democratic Presidential candidate Joe Biden, discusses his latest primary wins and the impact of the virus on the 2020 election. David Miliband talks about the impact of the coronavirus on the world's refugees and most vulnerable.

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