<em>Congress override Presidential Veto</em><em> is the best example of a check on presidential power</em>
Explanation:
The President has a power to reject to approve a bill. The President decides what money is required for each government department. The Constitution explicitly allows the president the power to sign or veto enactment.
When the President rejects a bill he still requires the 2/3 votes from the chamber of congress who votes on the bill. Veto is the power to unilateral stop a law or bill passed.
