Is America trapped in cycle of political violece?

Over the past year, the US has seen political assassination attempts and murders - the latest being Charlie Kirk, a leading, young conservative activist. Nick Bryant delves into the history of American political violence with historian Jeremi Suri from University of Texas at Austin. Also, filmmaker Max Uechtritz's new documentary PNG The Road to Independence screens on ABC TV this week, he joins PNG lawyer Serena Sasingian to discuss independence. And 25 years on from the Sydney Olympics, we take a walk down memory lane.