In arriving at its conclusion , the committee was advised by a Scientific Panel of four physicists from the Manhattan Project : Enrico Fermi and Arthur H. Compton of the Metallurgical Laboratory at the University of Chicago ; Ernest O. Lawrence of the Radiation Laboratory at the University of California at Berkeley ; and J. Robert Oppenheimer , who directed the bomb assembly program at Los Alamos . Reinforcing the decision arrived at on June 1 , the scientists wrote in a formal report on June 16 : Although the committee 's recommendation was addressed to Stimson , Byrnes went directly from the June 1 meeting to brief Truman , who reportedly concurred with the committee 's opinion . Reviewing the Scientific Panel 's report on June 21 , the committee reaffirmed its position The Interim Committee was given responsibility for the preparation of separate prepared statements for the President and the Secretary of War to be released when nuclear weapons were used . The job of drafting them was given to William Laurence . Laurence submitted them to Arthur W. Page for review , and he in turn passed them on to the Interim Committee . At its meeting on July 6 , the Interim Committee considered and adopted a set of British suggestions . The final draft of President Truman 's speech was handed to him at the Potsdam Conference on August 1 . Following the dropping of an atomic bomb on the Japanese city of Hiroshima on August 6 , Truman read out the press release , which declared that : In July 1944 , before the Interim Committee was formed , Bush , Conant and Irvin Stewart had produced a proposal for legislation to control nuclear energy . Conant submitted the proposals to the Interim Committee at its meeting on July 9 , 1945 . Harrison brought in two experienced lawyers , Kenneth Royall and William L. Marbury to take up the job of drafting the legislation . Their draft bill would have created a nine-man commission consisting of five civilian and four military members . It granted the commission broad powers to acquire property , to operate facilities , to conduct research and to regulate all forms of nuclear energy . The Royall-Marbury bill was reviewed by the Interim Committee at its July 19 meeting and revised in line with their suggestions . The bill was forwarded to the President in August . The Interim Committee met again on September 28 to discuss legislative strategy . The Royall-Marbury bill was introduced into the United States Congress by the chairman of the House Military Affairs Committee , Andrew J. May , and the ranking member of the Senate Committee on Military Affairs , Senator Edwin C. Johnson on October 3 . It then became known as the May-Johnson bill
Potsdam Conference
Potsdam Conference
Interim Committee