“After the [Iraq] war had begun, the television journalist Diane Sawyer pressed Bush on the difference between the assumption, ‘stated as a hard fact, that there were weapons of mass destruction,’ and the hypothetical possibility that Saddam ‘could move to acquire those weapons.’ Bush replied: ‘So what’s the difference?’ No offhand comment, this was Bush’s most articulate statement of the entire war, an artful parsing of a distinction that has little meaning in the context of national security.”