The U.S. coronavirus vaccine rollout continues to steam ahead, with the average rate of vaccinations barreling along at more than 3 million doses a day. However, there are some signs we may be close to hitting the so-called vaccine wall - when what has been a supply problem, flips into a demand problem. It comes as the U.S. expands vaccine eligibility to all adults over the age of 16 as of today. Dr. Dean Fanelli, partner at Seyfarth Shaw LLP, joined Wake Up with Cheddar for more.