There are people who are anxious about immigration for reasons that are perfectly sensible. They think it's uncontrolled. They think it's, therefore, arbitrary in its consequences, and there are some communities affected much more deeply than others.

But the world is ever more interdependent. Stock markets and economies rise and fall together. Confidence is the key to prosperity. Insecurity spreads like contagion. So people crave stability and order.

When Europe and America stand together the world is a better and more prosperous place.

For me, 9/11 was a game changer. It altered my perception of the security threat we faced. I took the position that Britain should be shoulder to shoulder with the U.S. It was a big decision; I didn't take it lightly, or in ignorance of its consequences. It's a big commitment for a country to give, but I believed it was the right thing to do.

I'm one of these people that, once you have had your election and you have elected your candidate, let's see what actually happens.

I say to the Taliban: surrender the terrorists; or surrender power. It's your choice.

Politics may be the art of the possible; but, at least in life, give the impossible a go.