INTERVIEW: Why do we often witness vitriol and personal attacks in US politics?

There's been a fair share of personal attacks and vitriol between US Republican candidate Donald Trump and Democratic candidate Kamala Harris as the US election nears. Many have become immune to vitriolic remarks in US politics, particularly from Trump, but why is this behaviour more common in US politics compared to Australia? SBS' Catriona Stirrat speaks to Associate Professor David Smith from the University of Sydney's United States Studies Centre for this edition of Weekend One on One.