A mixed message to Tehran

Iran is calling new US sanctions "idiotic" and says the door for negotiations with Washington is now permanently closed. So, what happens next? Also, an update on the case of an Iranian-British dual national jailed by Iran on espionage charges for the past three years. She maintains her innocence, and her husband is staging a hunger strike outside the Iranian Embassy in London. Plus, on the eve of the first Democratic 2020 presidential debate, we hear what main themes are emerging from the race when it comes to two major topics: immigration and climate.