Bolton: Trump 'doesn't understand how our nuclear navy works'

President Donald Trump issued a rare threat of nuclear escalation on Friday, saying he had ordered two nuclear submarines to be strategically positioned near Russia in response to what he said were aggressive remarks by Dmitry Medvedev, the country’s former president and current deputy chairman of its Security Council. Former Trump national security adviser John Bolton joins CNN’s Kaitlan Collins to discuss his take. #CNN​ #News​