New Doping Investigations Could Tarnish Olympic Gold

We update the latest developments in the Russian Olympic doping scandal, and the potential impact on this summer's games in Brazil. Guest host Todd Purdum hears from experts on anti-doping efforts and Olympic history, and an American athlete who might win a medal if her Russian opponent is disqualified.

Later on the program, surveying support for Donald Trump: Are voters reluctant to tell pollsters they like him?

Photo: RIA Novosti