Treaty power is a co-ordinated effort between the Executive branch and the Senate . The President may form and negotiate , but the treaty must be advised and consented to by a two - thirds vote in the Senate . Only after the Senate approves the treaty can the President ratify it . Once it is ratified , it becomes binding on all the states under the Supremacy Clause . While the House of Representatives does not vote on it at all , the requirement for the Senate 's advice and consent to ratification makes it considerably more difficult to rally enough political support for international treaties . Also , if implementation of the treaty requires the expenditure of funds , the House of Representatives may be able to block or at least impede such implementation by refusing to vote for the appropriation of the necessary funds .

Question: who is in charge of ratifying treaties in the us
Answer: the President