agreements with benefits applying only to signatories of those agreements (a) Initiation of negotiations (1) In general In order to enhance the economic well-being of the United States, the President shall initiate negotiations for a covered plurilateral trade agreement under this section when the President determines that it is in the national interest to do so. (2) Limitation The President may not initiate negotiations for a covered plurilateral trade agreement under this section until the date on which the United States Trade Representative provides the briefing required by section 3(a). (b) Authority for agreements (1) In general To strengthen the economic competitiveness of the United States by improving trade relations with countries similarly interested, the President may enter into covered plurilateral trade agreements in a sector of the economy specified in subsection (d). (2) Termination of authority The authority under paragraph (1) terminates on July 1, 2028. (c) Modifications permitted (1) In general Subject to paragraph (2), the President may proclaim such modification or continuance of any existing duty or continuance of existing duty-free or excise treatment as the President determines to be required or appropriate to carry out an agreement entered into under subsection (b). (2) Limitation Substantial modifications to, or substantial additional provisions of, an agreement entered into after July 1, 2028, are not covered by the authority under paragraph (1). (d) Sectors of the economy specified A sector of the economy specified in this subsection is any of the following sectors: (1) E-commerce and digital services. (2) Pharmaceuticals and medical countermeasures. (3) Environmental goods. (4) Services. (5) Any sector that is subject to substantial interference by a foreign government, including through excessive subsidies or state-owned enterprises. (e) Consultation with and notification to Congress The President shall consult with Congress regarding, and notify Congress of, the intention of the