“...the Marines are part of the navy...”
An Act of Congress in 1947 and Public Law 416, signed by President Truman on June 20, 1952, says otherwise. The Marine Corps is a separate military branch serving with the Navy under direction of the Secretary of the Navy. While both service branch heads co-operate willingly, the Chief of Naval Operations is not in the Marine Corps Chain of Command, and vice versa. The Commandant of the Marine Corps reports directly to the Sec. of the Navy, not to the CNO.
Then when I'm President I'll have to dissolve them in addition to the Air Force and NASA. The only Constitutional authorized military agencies are the Army and Navy.
The Marine Corps is a separate military branch serving with the Navy under direction of the Secretary of the Navy.
They are either a part of the navy or they are not; if the former then I could keep them on with good conscience, if the latter then my oath to uphold the Constitution would demand its dissolution (or roll-up into the Navy).
The Congress cannot create separate/new military branches and then fund them Constitutionally. To say "well, but" is precisely the reason that we're in the mess with ObamaCare, too much is deemed to be a-ok with respect to the Constitution when it is fairly questionable, or even when plainly not.
The same applies to other governmental agencies: EPA, DEA, Dept of Agriculture, DOE, other DOE, and so forth.