Harry Truman actually said...
There shall be exempted from the provisions of this order (a) all inventions within the jurisdiction of the Atomic Energy Commission except in such cases as the said Commission specifically authorizes the inclusion of an invention under the terms of this order; and (b) all other inventions officially classified as secret or confidential for reasons of the national security.
Context
Executive Order 9865—Providing for the Protection Abroad of Inventions Resulting from Research Financed by the Government
06/13/1947