Upping the ante in Iran

Brinkmanship is the high-stakes strategy of pushing a conflict to the edge to force an opponent to back down. US President Donald Trump seems to be taking it to new levels in the war with Iran. The World's Host Marco Werman speaks with Dan Drezner, a dean at Tuft's Fletcher School of Law and Diplomacy, about the tension currently on display between diplomacy and escalation and whether we're witnessing a new iteration of the "Madman Theory" at work.