Presidents can veto bills passed by Congress.

The presidential power to veto legislation passed by Congress is a crucial aspect of the system of checks and balances in the United States. When a president vetoes a bill, it means they reject it and prevent it from becoming law unless Congress overrides the veto with a two-thirds majority in both the House of Representatives and the Senate. This authority gives the president significant influence over the legislative process and helps ensure that one branch of government does not become too powerful. The veto power is a key tool presidents can use to shape the country's laws and policies.