A new memoir by a former U.S. national security advisor paints a chaotic picture of recent U.S. policy towards North Korea, revealing deep divisions within the administration — even as the country engaged in an unprecedented campaign of diplomatic outreach to Pyongyang.

John Bolton's book, titled "The Room Where It Happened" and slated for release this week, has already been denounced by his former boss. President Trump claims his notoriously-hawkish former national security advisor played a major role in scuppering once-rosy prospects for DPRK-U.S. diplomacy.