The ability of the president to veto legislation is an illustration of which constitutional principle?

The ability of the president to veto legislation is a clear illustration of the principle of checks and balances. This principle is foundational to the U.S. government and is designed to ensure that no single branch of government becomes too powerful. By granting the president the authority to veto legislation passed by Congress, the Constitution establishes a system in which the executive branch can check the legislative branch. This interaction ensures that both branches must consider each other's powers and responsibilities, fostering cooperation and negotiation.

In this context, when Congress passes a bill, it does so with the understanding that the president has the power to reject or approve it. The veto acts as a counterbalance to legislative authority, requiring a supermajority in Congress to override a presidential veto, which underscores the importance of a collaborative governing system.