If we don't act now, then we will go back to what has happened before and then of course the whole thing begins again and he carries on developing these weapons and these are dangerous weapons, particularly if they fall into the hands of terrorists who we know want to use these weapons if they can get them.

They could have been removed. They could have been hidden. They could have been destroyed.

Climate change is probably the greatest long-term challenge facing the human race.

I'm an avowed centrist, and I believe that - centrism is often - it's almost the wrong word to use, because it's often seen as sort of splitting the difference between right and left.

I think crime is a huge issue for people. If you were living in the poorest state, and you've got drug dealers at the end of the street, and your life's in misery, and you're afraid of your kids going out the door. I mean, the job of progressive politicians is to do something about that.

I do believe that if you reach a just and fair settlement between the Israelis and the Palestinians it will have a massive influence on countering extremism. Which is not to say that the Israel-Palestinian situation is the source of the problem, but it is very potent fuel.

Education is the best economic policy there is.