The phrase "ambassadorial nominee" refers to a person who has been chosen or nominated to represent their country as an ambassador to another country. Full definition
Some leaders of the All Progressives Congress, APC, across the country, including APC governors, have expressed discontent over the choice of non-career ambassadorial nominees whose names... (dailypost.ng)
Recently President Obama unveiled his new list of ambassadorial nominees. (inc.com)
So have Rep. Louise Slaughter (D - Rochester), Rep. Bill Owens (D - Plattsburgh), former Rep. Tim Bishop of Southampton and failed ambassadorial nominee George Tsunis of Lake Success. (newsday.com)