PBS NewsHour - Season 44 Episode 144

Friday on the NewsHour, the confrontation between the U.S. and Iran escalates further. Plus: A conversation with Iranian Foreign Minister Javad Zarif, dealing with the extreme heat that is a byproduct of climate change, new frontiers of space, 2020 campaign updates, political analysis from Mark Shields and David Brooks and a new musical venture from one of the founders of The Black Keys.