On Background: How did Trump win?

Donald Trump is back. Kamala Harris is promising a smooth transition. To say the US is in a different political universe to 4 years ago – is an understatement. How has this extraordinary comeback happened? Why has America returned to Trump? And what happens next? In Washington DC, David Speers talks to Lester Munson, a 25-year Capitol Hill veteran, most recently as Staff Director of the Senate Foreign Relations Committee, about how Trump stormed back into the White House.