My office is on Twitter. I don't tweet myself - at least, not intentionally, but I probably should do.

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.

When my parents were growing up the world's population was under three billion. During my children's lifetime, it is likely to exceed nine billion. You don't need to be an expert to realise that sustainable development is going to become the greatest challenge we face this century

Bill Clinton has been a true leader of the western world. He has been a friend and a counsel to me and other leaders right around the world.

I think most people who have dealt with me think I'm a pretty straight sort of guy, and I am.

I hope that people know me well enough and realise that I would never do anything to harm the country or anything improper. I never have. I think most people who have dealt with me think I am a pretty straight sort of a guy.

The big issue of our time is trying to deal with extremism based on a perversion of religion and how you get peaceful coexistence between people of different faiths and cultures.