Harry S. Truman was known for his plainspoken and straightforward speaking style. From his early days in office, he developed a reputation as an honest and extremely hardworking politician, and his public comments reflected these traits. Humorous and warm in person and in small groups, Truman could appear stiff when giving formal addresses. He generally disliked public speaking and had the distinct disadvantage of following Franklin D. Roosevelt, one of the best public speakers who ever sat in the Oval Office. But Truman was an enthusiastic campaigner, capable of passionate delivery, especially when speaking extemporaneously. On August 6, 1945, he made his Statement Announcing the Use of the Atomic Bomb on Hiroshima in a radio address, giving an overview of the Manhattan Project to build the bomb and defending its use to save American lives and shorten World War II.