WATCH: Obama, 'ISIL Is a Direct Outgrowth of Al-Qaida in Iraq Which Grew Out of Our Invasion'

In an interview with Vice News, President Obama attributed the rise of ISIS in Iraq and Syria to the U.S. invasion of Iraq in 2003. Obama also discussed the recent letter Senate Republicans sent to Iran.

AP

Short transcript:

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Shane Smith: 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-Qaida  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.