States, or are or come within the possession or control of a United States person. (B) Inapplicability of national emergency requirement The requirements under section 202 of the International Emergency Economic Powers Act ( 50 U.S.C. 1701 ) shall not apply for purposes of this paragraph. (2) Exclusion from United States (A) In general Except as provided in subparagraph (B), the Secretary of State shall deny a visa to, and the Secretary of Homeland Security shall exclude from the United States, any alien that is a person described in paragraph (4). (B) Compliance with United Nations headquarters agreement Subparagraph (A) shall not apply to the head of state of Iran, or necessary staff of that head of state, if admission to the United States is necessary to permit the United States to comply with the Agreement regarding the Headquarters of the United Nations, signed at Lake Success June 26, 1947, and entered into force November 21, 1947, between the United Nations and the United States. (3) Facilitation of certain transactions Except as provided in this section, the President shall prohibit the opening, and prohibit or impose strict conditions on the maintaining, in the United States of a correspondent account or a payable-through account by a foreign financial institution that the President determines knowingly, on or after the date that is 180 days after the date of the enactment of the Iran Nonnuclear Sanctions Act of 2017 , conducts or facilitates a significant financial transaction for a person described in paragraph (4). (4) Persons described A person is described in this paragraph if the President determines that the person, on or after the date that is 180 days after the date of the enactment of the Iran Nonnuclear Sanctions Act of 2017 — (A) operates in a sector of the economy of Iran included in the most recent list published by the President under subsection (a)