The approval of treaties requires what level of congressional support?

The approval of treaties requires a two-thirds majority in the Senate. This high threshold is established in Article II, Section 2 of the U.S. Constitution, which specifies that treaties must be ratified by a two-thirds vote of the senators present. The rationale behind this requirement is to ensure that significant commitments, such as treaties with foreign nations, reflect a broad consensus among the Senate members, fostering stability and continuity in U.S. foreign policy. Such a requirement emphasizes the seriousness of treaties and aims to prevent unilateral or hasty decisions that could have far-reaching implications for the country.

The other choices relate to different types of legislative actions but do not apply to treaty ratification. A simple majority in the House or Senate is the standard for passing most legislation, and three-fourths of both chambers is a requirement for constitutional amendments, which is a separate process from treaty approval.