By Order Of The President?

Source

Taken from Opinions of attorneys general..., the Opinion of 25 January 1821:

After the opinion I had the honor to express to you in the case of General Armstrong on the 25th January last, there can remain no question of law in the case; the only question which can remain is one of fact, to wit: "Was the General's excursion to Canada by the direction or order of the President?"