The power to approve treaties is the power that is granted to the senate but not to the house.
According to the Constitution, the Senate is the only body with the authority to ratify treaties reached by the executive branch with a two-thirds majority. Treaties are not ratified by the Senate. Instead, the Senate debates a ratification resolution, by which it formally advises and consents the president to move forward with ratification.
The First Congress's Senate established the standard for how it would conduct treaty discussion. If the parties intended to demonstrate their assent through such an act, ratification is defined as the international act in which a state expresses its consent to be bound by a treaty. In the case of multilateral treaties, the customary procedure is for the depositary to collect the ratifications of all states, keeping all parties informed of the situation. Ratification is typically accomplished in the case of bilateral treaties by exchanging the necessary instruments.
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