"Obama was also unsettled by a surprise visit early in the week from James Clapper, his director of national intelligence, who interrupted the President’s Daily Brief, the threat report Obama receives each morning from Clapper’s analysts, to make clear that the intelligence on Syria’s use of sarin gas, while robust, was not a “slam dunk.” He chose the term carefully. Clapper, the chief of an intelligence community traumatized by its failures in the run-up to the Iraq War, was not going to overpromise, in the manner of the onetime CIA director George Tenet, who famously guaranteed George W. Bush a “slam dunk” in Iraq."