SHANE SMITH, VICE NEWS: One of the biggest questions that I had was how did they become so popular so fast? How did they get so many foreign fighters from America, from the U.K., from Scandinavia, from all over the world, go there, outstrip al Qaeda, almost overnight. So, a, how did they become so popular out of nowhere? And then, b, how do we stop them?
PRESIDENT OBAMA: ISIL is direct outgrowth of al Qaeda in Iraq which grew out of our invasion which is an example of unintended consequences which is why we should generally aim before we shoot.
The full video of President Obama's interview with Vice News is available here.