What power allows the US president to reject a bill passed by Congress?

The power that allows the US president to reject a bill passed by Congress is known as the veto. When Congress passes a bill, it is sent to the president for approval. If the president disagrees with the bill, they can choose to veto it, which means the bill does not become law unless Congress takes further action to override the veto. This power is crucial in the system of checks and balances that defines the relationship between the legislative and executive branches of government, ensuring that no single branch can dominate the legislative process without input from the other.

The other options reflect different legislative processes or actions that do not pertain specifically to the president's ability to reject legislation. For instance, a filibuster is a tactic used in the Senate to delay or block legislative action, while an override is the process by which Congress can pass a bill despite a presidential veto if enough members vote in favor. An amendment refers to a change or addition made to a bill or constitutional document, which does not involve the presidential veto. All these options serve various functions within the legislative process but do not grant the president the authority to reject a bill outright as the veto does.