At G-20, leaders learn 'how difficult' consensus has become

At the G-20, the world's most powerful leaders are discussing global governance, but in an era of populism and protectionism, forging multilateral agreement is a challenge. Plus, Russian aggression toward Ukraine and Saudi Arabia’s role in a high-profile murder set an ominous tone. Still, President Trump is optimistic about reaching a trade deal with China. Nick Schifrin reports from Buenos Aires.