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


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.