Fmr. Aetna CEO Mark Bertolini on 'Medicare for All': No one can explain to me what it is

Former Aetna CEO Mark Bertolini joins “Squawk Box“ to talk about the state of the health care industry. The discussion touches on how the U.S. can improve its system, socialized medicine, and the recent Biogen Alzheimer's trial cancellation. » Subscribe to CNBC: About CNBC: From 'Wall Street' to 'Main Street' to award winning original documentaries and Reality TV series, CNBC has you covered. Experience special sneak peeks of your favorite shows, exclusive video and more.