Gottlieb: Expect Covid cases to drop heading into May

"I think we're going to start to see the pandemic rollover in the United States in terms of the cases coming down," Dr. Scott Gottlieb, member of the boards of Pfizer and biotech company Illumina and former FDA commissioner, told CNBC's "Squawk Box" Monday after headlines that half of U.S. adults have received at least one vaccine dose. "We're still going to have outbreaks in some parts of the country... but I think you're going to have cases come down quite dramatically as we get into May."