The Treaty Clause engages the President to make or go into arrangements with the "exhortation and assent" of 66% of the Senate. Interestingly, typical enactment progresses toward becoming law after endorsement by basic dominant parts in both the Senate and the House of Representatives.
According to section 10 "Limits on the state", clause 2 "Import-exort" of the first Article, and I quote "No State shall, without the Consent of the Congress, lay any Imposts or Duties on Imports or Exports, except what may be absolutely necessary for executing it's inspection Laws: and the net Produce of all Duties and Imposts, laid by any State on Imports or Exports, shall be for the Use of the Treasury of the United States; and all such Laws shall be subject to the Revision and Controul of the Congress." Therefore you always have to have the consent of the Congress
