Why the Cease-Fire With Iran Keeps Crumbling

After back-and-forth attacks and an exchange of fiery language between President Trump and Iran’s leaders, it appears that both sides have returned to open conflict. Today, David Sanger, the White House and national security correspondent for The New York Times, explains what brought us to this point, and what this new phase of the war tells us about how difficult it will be to end. Guest: David…