bernie sanders criticized hillary clinton for her vote to authorize the invasion of iraq in 2003. >> well, in fact i would argue that the disastrous invasion of iraq, something that i strongly opposed, has unraveled the region completely and led to the rise of al qaeda and to isis. i don't think any sensible person would disagree that the invasion of iraq led to the massive level of instability we are seeing right now. i think that was one of the worst foreign policy blunders in the modern history of the united states. >> here's former secretary of state clinton's response. >> i have said the invasion of iraq was a mistake. but i think if we're ever going to really tack many the problems posed by jihadi extreme terrorism, we need to understand it and realize that it has an