We are good friends, we get on well, we work well together, it has bowled me over in many ways to have such a warm reception. It's been an extraordinary two days in Washington.
But you have to look through all the pomp and circumstance to the grit of the relationship which is that in Afghanistan our troops are fighting together and on issues like Somalia and Iran and Syria, we are working together with the aim of making our countries safer.
So there is a purpose behind the pomp. That's the way Barack sees it and that's the way I see it."
The Prime Minister has said he had been "bowled over" by the warmth and reception he received from US President Barack Obama.
Our Political Editor looks at the significance behind David Cameron finishing his US tour with a visit to Ground Zero.