What is required to override a presidential veto in Congress?

To override a presidential veto in Congress, a two-thirds vote in both the House of Representatives and the Senate is required. This high threshold ensures that the decision to countermand the President's veto reflects a significant level of consensus among lawmakers, indicating that the legislature strongly disagrees with the President's decision on that particular piece of legislation.

This process highlights the checks and balances inherent in the U.S. political system, designed to prevent any one branch of government from becoming too powerful. The requirement of a two-thirds majority acts as a safeguard for the executive branch's authority while allowing Congress the means to enact laws that it believes are essential despite the President's objections.

The other options, while related to legislative processes, do not accurately reflect the established procedure for overriding a veto. A simple majority is insufficient to overturn a presidential veto, and a vote by the Supreme Court or a unanimous vote is not required in this context.