Although the Vice President Henry A. Wallace had been involved in the Manhattan Project since the beginning, his successor, Harry S. Truman, was not briefed on the project by Stimson until April 23, 1945, eleven days after he became president on Roosevelt's death on April 12, 1945. On May 2, 1945, Truman approved the formation of the Interim Committee, an advisory group that would report on the atomic bomb. It consisted of Stimson, James F. Byrnes, George L. Harrison, Vannevar Bush, James Bryant Conant, Karl Taylor Compton, William L. Clayton, and Ralph Austin Bard, advised by scientists Robert Oppenheimer, Enrico Fermi, Ernest Lawrence, and Arthur Compton. In a June 1 report, the Committee concluded that the bomb should be used as soon as possible against a war plant surrounded by workers' homes and that no warning or demonstration should be given.