Fmr. CDC Dir.: 'Can't count on' vaccine in 2020

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The Former Director of the Center for Disease Control and President and CEO of Resolve to Save Lives, Thomas Frieden, joins Ayman Mohyeldin to discuss the ongoing work to develop a COVID-19 vaccine. Frieden says the country will need to "pull out all the stops" to get a vaccine distributed, and until then restrictions cannot be fully lifted.