This person would be considered a diplomat
A delegate I belive
I believe you are thinking of an ambassador.
Ambassador
An ambassador.
Ambassador.
ambassador
an advocate
An Ambassador.
diplomat
proxy
An expatriate, often referred to as an expat, is a person who moves from one country to live and work in another. This can be for various reasons such as job opportunities, lifestyle preferences, or personal relationships.
How do you sponsor a person coming from another country to the US
Such a person is known as a patriot.