Bill Richardson, former governor of New Mexico

Stephen Sackur speaks to Bill Richardson, former Clinton cabinet secretary and one time US North Korea emissary. The next couple of months will present President Donald Trump with foreign policy choices that could define his presidency. A summit meeting with North Korean leader Kim Jong-un is looming, so too a decision on whether to dump the nuclear deal with Iran. And never far from the surface, how to handle relations with Vladimir Putin's Russia. What is Trump's brand of disruption doing to US foreign policy?