taxation. (3) Measures aimed at limiting the risk of tax evasion or avoidance. (4) Entry into force conditioned upon confirmation by the President of approval by the United States Congress, as described in section 4, and relevant authority in Taiwan and necessary steps taken to enable implementation. (c) Limitation The Agreement authorized to be negotiated and concluded under this section may not include elements outside the scope of the 2016 United States Model Income Tax Convention. 4. Consultation (a) Notification upon commencement of negotiations The President shall provide written notification to the appropriate congressional committees of the commencement of negotiations between AIT and TECRO on the Agreement at least 15 calendar days before such commencement. (b) Reports Not later than 90 days after commencement of negotiations on the Agreement, and every 180 days thereafter until conclusion of the Agreement, the President shall submit a report to the appropriate congressional committees providing an update on the status of negotiations, including a description of elements under negotiation. (c) Consultations during negotiations In the course of negotiations conducted under the authorities of this Act, the Secretary of the Treasury, in coordination with the Secretary of State, shall— (1) meet, upon request, with the Chairman or Ranking Member of the appropriate congressional committees regarding negotiating objectives and the status of negotiations in progress