A treaty requires consent of two-thirds of senators present before the president decides whether to ratify it. An executive agreement avoids that treaty-consent procedure, but its legal basis matters: it may implement a treaty or an enacted statute, including a congressional-executive agreement authorized through bicameralism and presentment, or it may rest on independent presidential authority. Congress shapes foreign policy through appropriations, foreign commerce, sanctions, immigration law, military regulation, confirmations, and oversight. Neither treaty nor agreement may override the Constitution.

Suppose Congress authorizes sanctions and the president concludes an agreement explaining how the Treasury Department will coordinate enforcement with an ally. The absence of an Article II treaty vote does not automatically invalidate the agreement; statutory authorization may support it. If the agreement instead promises spending Congress never appropriated or contradicts the sanctions law, the diplomatic label cannot cure the conflict.

Identify the precise act. Recognition, negotiation, Senate treaty consent, domestic implementation, funding, and regulation of commerce are related but distinct. Ambassadors also require presidential nomination and Senate confirmation. "Chief diplomat" describes presidential leadership, not an answer to every foreign-policy question.

Video lesson: Presidential Power: Crash Course Government and Politics #11