Barack Obama: “We are at war with ... a very specific group -- al Qaeda and its affiliates.”

A drift towards extremism was "not inevitable

It is a decision about how do we face and embrace this finite amount of time we have on the planet.

If I had a blame pie for why politics is so polarised and why we're seeing a rise of populism in many places, it's because of that information that is going into our brains every day.

And I will fight for that, even if I don’t always think it’s going to win.