Kaine: Trump’s Iran deal announcement leaves ‘America alone’

President Trump's announcement that the U.S. is leaving the Iran nuclear deal is going to raise the risk of unnecessary war in the Middle East, says Sen. Tim Kaine, D-Va. A member of the Senate Foreign Relations Committee, Kaine also tells William Brangham that the decision has driven a wedge between the U.S. and European allies, and makes the U.S. weaker.