What fraction of the Senate must approve a treaty for it to be ratified?

The Constitution specifies that for a treaty to be ratified, it must receive the approval of two-thirds of the Senators present. This requirement underscores the importance of achieving broad consensus for international agreements, reflecting the significance and potential impact of treaties on U.S. foreign policy and relations. The higher threshold of two-thirds distinguishes treaty ratification from other legislative actions, which may only require a simple majority. This ensures that treaties are supported by a substantial portion of the Senate, promoting stability and continuity in international commitments.