White House historian explains move in process for president, family on Inauguration Day

WILMINGTON, DELAWARE - AUGUST 20: : Democratic presidential nominee Joe Biden greets his wife Dr. Jill Biden on the fourth night of the Democratic National Convention from the Chase Center on August 20, 2020 in Wilmington, Delaware. The convention, which was once expected to draw 50,000 people to Milwaukee, Wisconsin, is now taking place virtually due to the coronavirus pandemic. (Photo by Win McNamee/Getty Images)