The G20 is preparing to kick off in South Africa this weekend. It's supposed to be when the world's major powers come together to tackle the biggest global challenges, from economic stability to climate change. But this year's summit in Johannesburg begins with something extraordinary: virtually no senior US presence. All of it unfolds as South Africa confronts another unexpected crisis: mystery flights carrying Palestinians from Gaza into the country, which officials fear could signal an effort to remove Palestinians from their homeland. South African Foreign Minister Ronald Lamola joins the show from Johannesburg. 

Also on today’s show: Rev. Alex Santora; author Elizabeth Kolbert