I don't know why everyone is fretting so much about the cost of the wall. Trump can crowd source the wall with the promise of ad revenue. He can use his proven real estate financing skills to borrow the money, build with inexpensive migrant labor, then stiff the investors and contractors -- the wall will be built for free, ad revenue will be channeled through his charities, and lawyers will make a lot of money pointlessly attempting to avenge something. Pointless because the Justice and Legislative branches will be in Trump's pocket.