A Difficult Diplomatic Triangle

When a nuclear fuel enrichment site in Iran blew up this month, Tehran immediately said two things: The explosion was no accident, and the blame lay with Israel. Such an independent action by Israel would be a major departure from a decade ago, when the country worked in tandem with the United States to set back Iran’s nuclear ambitions. We look at what the blast says about relations between the United States, Iran and Israel. Guest: David E. Sanger, a White House and national security correspondent for The New York Times.