Sy Hersh reveals the rift between the Pentagon and the Secretary of Defense over the war in Iraq. The article refers to claims that Rumsfeld chose to believe reports of Iraqi exiles over intelligence gathered on the ground. This brings to mind a quote from Machiavelli I had a vague memory of, refreshed by a quick Google:
We see, then, how vain the faith and promises of men who are exiles from their own country. As to their faith, we have to bear in mind that, whenever they can return to their own country by other means than your assistance, they will abandon you and look to the other means, regardless of their promises to you. And as to their vain hopes and promises, such is their extreme desire to return to their homes that they naturally believe many things that are not true, and add many others on purpose; so that, with what they really believe and what they say they believe, they will fill you with hopes to that degree that if you attempt to act upon them you will incur a fruitless expense, or engage in an undertaking that will involve you in ruin….A prince therefore should be slow in undertaking any enterprise upon the representations of exiles, for he will generally gain nothing by it but shame and serious injury.
Machiavelli, The Discourses (1531), chapter 32