Harry S. Truman: And Truman interrupts him with a question, saying, "Well, Dr. Oppenheimer, when do you think the Russians are going to get this weapon of mass destruction?" J. Robert Oppenheimer: And Oppenheimer is sort of taken aback by the question and says, "Well, I'm not sure but sometime in the future." Harry S. Truman: And Truman interrupts again and says, "Well, I know. Never." Self - Co-author, American Prometheus: At that point, Oppie understands that Harry Truman doesn't understand anything about the physics of this weapon. Self - Co-author, American Prometheus: And Oppenheimer, at that point, says exactly the wrong thing. J. Robert Oppenheimer, Self - Author, The Making of the Atomic Bomb: RHODES: He really offended President Truman by saying, "Mr. President, I have blood on my hands." Self - Co-author, American Prometheus: BIRD: This is exactly the wrong thing to say to the guy who made the decision to drop two such bombs on two Japanese cities.