Evidently, it existed in the mind of George Washington, too. But what would HE know about constitutional intent?
He certainly hasn't left behind the slightest trace of such a sentiment in his writings or recorded speeches, so there is no "evidently" about it.
But what would HE know about constitutional intent?
Since he presided over the Constitutional Convention and since he was the close confidant of Alexander Hamilton, he clearly was intimately familiar with the Constitution's intent.
He warmly endorsed The Federalist as a worthy exposition of the Constitution's intent, and The Federalist's broad view of the President's authority to conduct both warfare and foreign affairs would presumably coincide in the main with his own.