The President's News Conference
12/29/1948
https://www.presidency.ucsb.edu...
Now, Therefore, I, Harry S. Truman, President of the United States of America, conforming to our hallowed custom, and in...
Say in about 6 months.
As President, I feel it my duty to protect the men who are engaged in this crucial work from such attacks.
The weapons of destruction have become so powerful and so terrible that we can't even think of another all-out war.