Which entity can override a presidential veto?

The ability to override a presidential veto lies in the hands of both the Senate and the House of Representatives. When the President vetoes a bill, Congress can respond by attempting to enact the legislation despite the objection from the executive branch. This requires a two-thirds majority vote in both chambers. If both the Senate and the House achieve this supermajority, the bill becomes law, effectively nullifying the President's veto. This process reflects the system of checks and balances designed to prevent any single branch of government from wielding excessive power.

The other options do not accurately represent how the veto override process works. The Senate alone or the House alone does not possess the authority to overturn a presidential veto; both chambers must act in concert. The Supreme Court, while it serves a critical role in interpreting laws and ensuring their constitutionality, does not have the authority to override a presidential veto, as this power is enshrined in the legislative function of the Congress.