Tension between the U.S. and North Korea escalated sharply Tuesday after President Trump suggested he was prepared to start a nuclear war, threatening to unleash "fire and fury" against North Korea. Hours later, North Korea threatened to strike the U.S. territory of Guam in the western Pacific. Guam is home to 163,000 people as well as major U.S. military bases. For more, we speak with longtime investigative journalist Allan Nairn.