B. the Constitution.
Explanation:
- The president is at the forefront of the executive branch of the federal government, and his role is to enforce and obey the U.S. Constitution and the laws prescribed by Congress.
- Article 2 of the United States Constitution proclaims the President the Commander-in-Chief of the Armed Forces and enumerates his powers, including the power to promulgate the law or veto proposals by both houses of Congress.
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