Mark Carney's powerful speech for middle powers to unite

Charles Kupchan and Malcolm Turnbull assess the week of diplomacy at Davos in Switzerland this week, the implications of Trump's America first approach and the remarkable speech made by Canadian Prime Minister Mark Carney, who described the end of the era underpinned by United States. Plus Niki Savva on the "inevitable" split of the Coalition and the future of Sussan Ley's leadership of the Liberal Party.