Just tell him the basics: the constitution was hijacked in 1870, and everything after that was unconstitutional. It's a bunch of complicated stuff having to do with banking after the civil war, and a corporation owning the country.

For more than that, you'd have to go to the links supplied by others. From my perspective, regardless of the legality, if the military backs it, it'll happen; if they don't, it won't. But it seems legit to me, and a worthy path to pursue.