President Donald Trump has claimed voter fraud, and those who have been counting the votes have something to say. Bill Whitaker reports. David Martin get an inside look at the government’s ambitious program to get a COVID-19 vaccine to 300 million Americans -- Operation Warp Speed. 'Ken Burns’ documentaries have ranged from the Civil War, to baseball, to Vietnam, and country music. Scott Pelley sits down with the filmmaker to talk about his 40+ years telling America’s story. Those stories on this week's "60 Minutes."