Lewis, author of 'Moneyball' and 'The Big Short,' examines the energy, agriculture and commerce departments under President Trump. Lewis warns that half of the top 700 positions in the administration remain unfilled, and some of the people who have been appointed have conflicts of interest, or are unqualified, making them unprepared to deal with risks. "Many of them are potentially catastrophic risks — the risk of a pandemic, or the risk of a nuclear accident, or the risk of a terrorist attack — one after another. And many of these are not risks that most people are thinking about," Lewis says. His new book is 'The Fifth Risk.'