The Trump Effect: How He Changed America

His election to the presidency, decided by fewer than 80,000 votes, was the biggest political upset of a generation. Four years on, Donald Trump's impact on America has been seismic - and the aftershocks continue to reverberate.

From heightened racial tensions to the politics of grievance, Nick Bryant explores how President Trump has changed the presidency, and the country, in ways no-one could have imagined.