US Presidency
1851

From which it appears that the Army and Navy are by the Constitution placed under the control of the Executive; and probably no legislation of Congress could add to or diminish the power thus given but by increasing or diminishing or abolishing altogether the Army and Navy. But not so with the militia. The President can not call the militia into service, even to execute the laws or repel invasions, but by the authority of acts of Congress passed for that purpose. But when the militia are called into service in the manner prescribed by law, then the Constitution itself gives the command to the President. Acting on this principle, Congress, by the act of February 28, 1795, authorized the President to call forth the militia to repel invasion and suppress insurrections against a State government, and to suppress combinations against the laws of the United States, and cause the laws to be faithfully executed.