 Biden is trying to ease concerns among his allies and voters following his debate performance last week, which prompted some of his fellow Democrats to call on him to drop out of the race. Fourth of July holiday vacations are expected to last well into the weekend since the TSA doesn't expect to see a traveler's rush until Sunday. Spokesperson Lisa Farbstein says nearly three million airline passengers have been screened at airports around the country almost every day since the holiday rush kicked off.