Lyndon Johnson actually said...
The country will need the help of scientists, including a large and strong contingent of physicists, if we are ever to be able to deal effectively with the central problems of the present and the future, to deal with the problems of peace in the world, and the welfare of three-quarters of the population of the earth who tonight live on the narrow edge of existence.
Context
Remarks to Members of the American Physical Society.
04/25/1967