'A Promised Land': Barack Obama tells his story in new autobiography

Barack Obama's much-awaited memoir, "A Promised Land", is hitting the shelves. The 700-page tome takes us from the former US president's childhood to the killing of Osama bin Laden during his first term in office. In the book, he makes clear that Donald Trump's presidency was no accident and was triggered by his own stint in the top job. We take a closer look.