Which of the following has the authority to veto a bill?

The president of the United States has the authority to veto a bill. This power is established in the U.S. Constitution, specifically in Article I, Section 7, which outlines the legislative process and the role of the president in that process. When Congress passes a bill, it is sent to the president, who can either sign it into law or exercise the veto power. If the president chooses to veto the bill, it is returned to Congress, where lawmakers can attempt to override the veto by a two-thirds majority vote in both the House and the Senate.

Other options listed do not have veto authority. The House of Representatives and the Senate can create, amend, and pass legislation, but they do not possess the power to veto bills independently—only the president can do that. Meanwhile, the Supreme Court does not have a role in the legislative process; its function is to interpret laws and determine their constitutionality, but it cannot veto or repeal legislation. This separation of powers is a key component of the U.S. government system, ensuring that no single branch holds excessive power.