Question

According to Article I of the Constitution, who has the ability to approve foreign treaties?

Answer 1

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

Answer 2

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.