An ambassador is a high-ranking diplomatic representative who is appointed by a country's government to represent their interests in a foreign country.
A legislator refers to an individual who holds a position in one of the legislative bodies at the federal or state level.
A mayor is an elected official who serves as the head of a city or town government.
A diplomat is a government official who represents their country's interests and promotes its policies in international relations.
In the United States, a senator is a member of the upper chamber of Congress, the legislative branch of the federal government.