Just a few months after the European war's conclusion, newspaper accounts described the findings of the United States Strategic Bombing Survey, publicly released on 30 October 1945, which gave the German estimates of 60,000–100,000 deaths in the Hamburg bombings. And even higher numbers sometimes were still used. During the 1949–50 debate within the U.S. government about whether to proceed with development of the hydrogen bomb, arguments based on morality were made against developing a weapon whose main utility seemed to be killing massive numbers of civilians with one detonation. Objecting to this line of reasoning, Senator Brien McMahon, chairman of the United States Congressional Joint Committee on Atomic Energy, wrote a letter to President Harry S. Truman in which he asked, "Where is the valid ethical distinction between the several Hamburg raids that produced 135,000 fatalities," the March 1945 firebombing of Tokyo, the atomic bombing of Hiroshima, and the proposed thermonuclear weapon. McMahon concluded that "There is no moral dividing line that I can see" between any of these.