Sec. 19.
(1) The board is authorized and directed in aid of the accomplishment of the purposes of this Act
(a) To make all necessary rules and regulations to carry out the provisions of this Act;
(b) To make rules and regulations affecting shipping in the foreign trade not in conflict with law in order to adjust or meet general or special conditions unfavorable to shipping in the foreign trade, whether in any particular trade or upon any particular route or in commerce generally and which arise out of or result from foreign laws, rules, or regulations or from competitive methods or practices employed by owners, operators, agents, or masters of vessels of a foreign country; and
(c) To request the head of any department, board, bureau, or agency of the Government to suspend, modify, or annul rules or regulations which have been established by such department, board, bureau, or agency, or to make new rules or regulations affecting shipping in the foreign trade other than such rules or regulations relating to the Public Health Service, the Consular Service, and the Steamboat Inspection Service.
(2) No rule or regulation shall hereafter be established by any department, board, bureau, or agency of the Government which affect shipping in the foreign trade, except rules or regulations affecting the Public Health Service, the Consular Service, and the Steamboat Inspection Service, until such rule or regulation has been submitted to the board for its approval and final action has been taken thereon by the board or the President.
(3) Whenever the head of any department, board, bureau, or agency of the Government refuses to suspend, modify, or annul any rule or regulation, or make a new rule or regulation upon request of the board, as provided in subdivision (c) of paragraph (1) of this section, or objects to the decision of the board in respect to the approval of any rule or regulation, as provided in paragraph (2) of this section, either the board or the head of the department, board, bureau, or agency which has established or is attempting to establish the rule or regulation in question may submit the facts to the President, who is hereby authorized to establish or suspend, modify, or annul such rule or regulation.
(4) No rule or regulation shall be established which in any manner gives vessels owned by the United States any preference or favor over those vessels documented under the laws of the United States and owned by persons who are citizens of the United States.