We got an international coalition [against Iran], and we imposed that. It was slow, patient diplomacy, nothing at all particularly headline-worthy. But then you got to the point where the negotiations - which I started and Secretary [John] Kerry completed - I think made the world safer.

It is, from my perspective, less important today looking backwards as to why these militants decided they did it than to find them and bring them to justice, and then maybe we'll figure out what was going on in the meantime.

I remember, particularly, a trip to Bosnia where the welcoming ceremony had to be moved inside because of sniper fire.

Personally, having, you know, lived and worked in the White House, having been a senator, having been Secretary of State, there has traditionally been a great pool of very talented, hard-working people.

I've always been intrigued by the Senate, and admired many of the people who have served there.

Don't let life pass you by before you realise that it was worth living.

We need better police training.