1. Short title This Act may be cited as the Marine Access and State Transparency or the MAST Act . 2. Congressional authorization of declarations of national monuments and restrictions on public use (a) Declarations of national monuments Section 320301 of title 54, United States Code, is amended— (1) in subsection (a), by striking The President may and inserting After obtaining congressional approval of a proposed national monument and certifying compliance with the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.) with respect to the proposed national monument, and subject to subsection (e), the President may ; and (2) by adding at the end the following: (e) Requirements for declarations of marine national monuments (1) Requirements The President may not declare any area of the exclusive economic zone to be a national monument unless— (A) such declaration is specifically authorized by an Act of Congress; (B) the President has submitted a proposal to make such declaration to the Governor of each State, and of each territory, any part of which is located within 200 nautical miles of that area; (C) each such Governor submits to the President notice that the legislature of that State or territory has approved the proposal