The president and prime minister celebrate the enduring relationship between Britain and the United States in a jointly written article in the Washington:
"The alliance between the United States and Great Britain is a partnership of the heart, bound by the history, traditions and values we share.
"But what makes our relationship special — a unique and essential asset — is that we join hands across so many endeavours.
"Put simply, we count on each other and the world counts on our alliance.
"Our troops and citizens have long shown what can be achieved when British and Americans work together, heart and hand, and why this remains an essential relationship — to our nations and the world."