Letter to America
Gordon Brown will today evoke the memory of President John F Kennedy. Standing in the Kennedy library beside his brother Teddy. The prime minister will echo JFK's global call for inter-dependence. He will praise American leadership after World War II and in the Cold War and argue that it is needed again to reform global institutions to tackle problems that are themselves global in scale. The prime minister's aides say that his speech today is a letter to America written at a time when it is ready to re-engage with the world. Mr Brown believes that George Bush has abandoned the isolationism of his first term in office and that whoever succeeds him will go much further still.
I've been speaking to Henry Kissinger, John Bolton, Sir Christopher Meyer and Robin Niblett - the director of Chatham House - about today's speech for a report on the Today programme which you can hear here.