Letter from the Secretary of the Senate transmitting message from the President of the United States returning without approval the bill (S. 1004) entitled "An act to amend the Atomic Energy Act of 1946 so as to grant specific authority to the Senate members of the Joint Committee on Atomic Energy to require investigations by the Federal Bureau of Investigation of the character, associations, and loyalty of persons nominated for appointment, by and with the advice and consent of the Senate, to offices established by such act".