The executive branch-the u.s. department of state provides the foreign service with detailed instructions for the negotiation and conclusion of treaties and international agreements. the secretary of state authorizes negotiation. after u.s. representatives negotiate and terms have been agreed upon by the secretary of state, the treaty is signed and the president submits the treaty to the senate. the senate foreign relations committee considers the treaty and reports to the senate, which must approve the treaty by a two-third majority. finally, the president proclaims the treatys entry into force.