Harry Truman actually said...
Notwithstanding the provisions of the foregoing paragraphs (a) and (b), no alien applying for admission, even with a valid permit to enter, shall enter or be permitted to enter the United States if it appears to the satisfaction of the Attorney General that such entry would be prejudicial to the interests of the United States.
Context
Proclamation 2850—Amendment of Proclamation No. 2523 Prescribing Regulations Relating to the Control of Persons Entering or...
08/16/1949