Dr. Todd Ellerin discusses what is needed to close the gap between the number of vaccines distributed versus doses administered, and how more mass vaccination sites in the U.S. will help.
The Russian opposition leader was detained immediately after landing in Moscow from Germany.
Security measures are expected to be the tightest they have ever been for a presidential inauguration.
Police said Josephus Davis, 20, has been charged with the murder of Milan Loncar.
Incoming Biden Communications Director Kate Bedingfield is interviewed on "This Week."
Republican Rep. Peter Meijer of Michigan is interviewed on "This Week."