Which executive branch leader is responsible for managing diplomats

The correct answer is the Secretary of State.

The Secretary of State oversees the Department of State, which is the Executive agency that all Ambassadors and Diplomats live under.

The Secretary of State

Explanation:

The Secretary of State is the head of the United States Department of State. This departments deals  with foreign affairs and foreign policies and oversees the work of diplomats and ambassadors.

All embassies fall under the State Department's jurisdiction and all diplomats and ambassadors answer directly to the Secretary of State,.

Diplomats and ambassadors are appointed by the President and serve 'at his pleasure', meaning they can be dismissed at any time.

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