The Late Show with Stephen Colbert is ending after more than a decade on air. Colbert was known for his jabs at global politics and US President Donald Trump, as well as light-hearted humour sprinkled between conversations about grief and his faith. Matt Galloway speaks with Sophia McClennen, the author of the book “Colbert’s America: Satire and Democracy” and “Trump was a Joke: How Satire Made Sense of a President Who Didn’t.”