case affecting an ambassador

It is that of a public prosecution, instituted and conducted by and in the name of the United States, for the purpose of vindicating the law of nations, and that of the United States, offended... by an assault committed on him by a private individual. It is a case, then, which affects the United States, and the individual whom they seek to punish; but one in which the minister himself, although he was the person injured by the assault, has no concern, either in the event of the prosecution, or in the costs attending it.