Which amendment process requires a two-thirds majority in both houses of Congress?

The amendment process that requires a two-thirds majority in both houses of Congress is the process of proposing an amendment. This provision is part of Article V of the U.S. Constitution, which outlines how constitutional amendments can be initiated. Specifically, for Congress to propose an amendment, a two-thirds vote in favor is needed in both the House of Representatives and the Senate. This ensures that any proposed change to the Constitution reflects a significant consensus among elected representatives, emphasizing the importance of broad support for constitutional amendments.

In contrast, ratifying an amendment involves approval from three-fourths of state legislatures or state conventions, which does not require congressional involvement at that stage. Repealing an amendment would also follow a similar process to proposing an amendment, as it would necessitate the same two-thirds majority in Congress. Amending the Constitution refers broadly to the overall process, which includes both proposing and ratifying amendments, but the specific requirement for a two-thirds majority pertains exclusively to the proposal phase conducted by Congress.