President Trump announced John Bolton will be his new National Security Advisor just as the White House prepares for historic talks with North Korea. Just last month, Bolton called for pre-emptive strikes on North Korea. In 2015, he endorsed war with Iran. Vox's Zack Beauchamp tells Sean Rameswaram about Bolton's controversial background and what it means to have a hawkish advisor seated next to the president.Learn more about your ad choices. Visit podcastchoices.com/adchoices