Jane Mayer on Robert Mercer & the Dark Money Behind Trump and Bannon

We look at Robert Mercer, the man who is said to have out-Koched the Koch brothers in the 2016 election. The secretive billionaire hedge-fund tycoon, along with his daughter Rebekah, is credited by many with playing an instrumental role in Donald Trump's election. "The Mercers laid the groundwork for the Trump revolution," Trump's chief strategist Stephen Bannon said. "Irrefutably, when you look at donors during the past four years, they have had the single biggest impact of anybody, including the Kochs." Before Bannon and Kellyanne Conway joined the Trump campaign, both worked closely with the Mercers. The Mercers bankrolled Bannon's Breitbart News, as well as some of Bannon's film projects. Conway ran a super PAC created by the Mercers to initially back the candidacy of Ted Cruz. While the Mercers have helped reshape the American political landscape, their work has all been done from the shadows. To talk more about the Mercers, we speak with Jane Mayer, staff writer at The New Yorker. Her latest piece is headlined "The Reclusive Hedge-Fund Tycoon Behind the Trump Presidency: How Robert Mercer exploited America's populist insurgency." She is also author of "Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right," which just came out in paperback.