Dr. Homer Venters on "Life and Death in Rikers Island"

Former U.S. ambassador to NATO Kurt Volker joins the show. In part two of his exclusive conversation with Christiane, Qatar's prime minister discusses stability in the Middle East, Syria’s return to the Arab League and LGBTQ rights. Acting deputy secretary of state Victoria Nuland discusses the political implications of U.S. foreign policy in Ukraine. Tim Wu explains the case against Google.

Babak Namazi, brother of freed prisoner Siamak Namazi discusses his brother's homecoming. Qatari Prime Minister Al-Thani on the deal his country brokered between the US and Iran. Al Gore speaks about the global status of climate change. Singaporean foreign minister Vivian Balakrishnan talks about China's growing influence. Billie Jean King on 50 years since winning the Battle of the Sexes.

At the United Nations General Assembly, more than 100 world leaders are gathering to discuss pressing world issues, from climate to grinding poverty. Irish prime minister Leo Varadkar, Australian foreign minister Penny Wong and NATO Secretary-General Jens Stoltenberg join the show. Diana B. Henriques on her new book, "Taming the Street."