The president has the power to:

The power to veto bills is indeed one of the significant responsibilities of the president. This authority enables the president to reject legislation passed by Congress, thereby preventing it from becoming law. This power serves as a crucial check on the legislative branch, ensuring that the president can influence national policy and protect the interests of the executive branch. The veto can be overridden only if two-thirds of both the House of Representatives and the Senate vote to pass the bill again, emphasizing the president's role in the legislative process.

Other options involve powers that the president does not hold directly. While the president can negotiate treaties, these must be ratified by a two-thirds majority in the Senate, indicating that the president cannot unilaterally establish treaties without legislative approval. The declaration of war is formally a power of Congress, although the president holds significant influence over military actions as the commander-in-chief. As for amending the Constitution, this is a process that involves both Congress and state legislatures, and the president does not have an active role in this procedure.