These guys in Oregon insist that they are a militia and thus entitled to their guns because you have to read the 2nd Amendment very strictly.
OK, fine. Then let’s read Article II just as strictly: “The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States.”
There you go. Simple solution: Obama orders them to surrender. When they don’t, you arrest them and court martial them.