Expect Covid-19 vaccine to be seasonal like the flu shot, says former FDA chief Scott Gottlieb

White House health advisor Dr. Anthony Fauci said he worries about the "durability" of a potential coronavirus vaccine, saying there's a chance it may not provide long-term immunity. Additionally, President Trump recently announced that the U.S. will terminate its relationship with the world health organization. Dr. Scott Gottlieb, member of the boards of Pfizer and biotech company Illumina and former FDA commissioner, joins "Squawk Box" to discuss.