Whenever the President, after consultation with the President of the Philippines, finds that adequate supplies of neither copra nor coconut oil, the product of the Philippines, are readily available for processing in the United States, he shall so proclaim, and after the date of such proclamation the provisions of section 2470(a)(2) of the Internal Revenue Code shall be suspended until the expiration of 30 days after he proclaims that, after consultation with the President of the Philippines, he has found that such adequate supplies are so readily available.