Johnson & Johnson board member Dr. Mark McClellan says the company expects 20 million doses delivered by the end of March as the U.S. becomes one step away from adding a third safe and effective vaccine to its arsenal. "There is going to be a ramp-up period, so 4 million doses expected next week, going higher during the month of March with 20 million doses delivered by the end of March," said the former FDA Commissioner in a Friday evening interview on "The News with Shepard Smith." "That's coming on top of some expansions in the supply from the Pfizer and Moderna vaccines, they're expecting close to 90 million, 100 million doses ...