No act or omission to act pursuant to this chapter which occurs while this chapter is in effect, if requested by the President pursuant to a voluntary agreement or program approved under subsection (a) of this section and found by the President to be in the public interest as contributing to the national defense, shall be construed to be within the prohibitions of the antitrust laws or the Federal Trade Commission Act [
15 U.S.C.
41 et seq.] of the United States. A copy of each such request intended to be within the coverage of this section, and any modification or withdrawal thereof, shall be furnished to the Attorney General and the Chairman of the Federal Trade Commission when made, and it shall be published in the Federal Register unless publication thereof would, in the opinion of the President, endanger the national security.