Since President Trump took office a year ago, tensions between the United States and North Korea have ballooned. The leaders of both countries have traded jabs over twitter and in the media, raising concerns over potential nuclear war. However, tension between the U.S. and North Korea is nothing new. Former UN Ambassador Samantha Power says North Korea was--and still is--the "hardest problem in the world. She discusses the challenges that the Obama administration faced dealing with the Hermit Kingdom, and shared some advice for the Trump administration. Power is one of the Obama administration officials documented in the new HBO documentary, "The Final Year." Greg Barker, the director of the film, says he wanted to give people an inside look into the long hours that go into the major foreign policy decisions made by the Obama administration's top foreign policy officials. "The Final Year" follows a number of officials, including Power and Former Secretary of State John Kerry, during the final year of the Obama's presidency.