I would do it a different way: describe the Cabinet controversy over Hamilton’s Bank Bill, first in the House, then in the Cabinet. Then, tell them this remains the basic outline of constitutional disputation ever since. Throw in that Washington’s decision to have a Cabinet debate on his own treasury secretary’s favorite proposal reflects the very different conception of the presidency shared by the first six presidents. I think that giving the argument three famous faces (Washington, Jefferson, Hamilton) makes it far more memorable than straightforward talk about the Tenth Amendment — which describing Jefferson’s memo. allows you to work in anyway.