On 16 March 1939, Goerdeler suggested to Young that Britain call an international conference to discuss "legitimate" German demands for changes in the international order. Goerdeler claimed that Hitler would refuse to attend the conference, which would so discredit him as to bring about his downfall. Young passed on Goerdeler's conference idea to Cordell Hull, who was so impressed that he offered to bring about the proposed conference to be chaired by US President Franklin D. Roosevelt. That was the origin of Roosevelt's famous appeal to Hitler and Mussolini on 15 April 1939 for both leaders promise public not to disturb the peace for the next ten years. In exchange, Roosevelt promised a new economic international order.