First of all - Trump will never build a complete wall. I hope he does, but ain't gonna happen.
Secondly - should he actually be a man of his word, and builds the wall. - the next Democrat administration in 4 years can simply declare "Open Wall Wednesday" or some such thing, and meanwhile all that was accomplished was getting Trump elected.
Over the next four years, more of the American public will realize how democrat Presidents exclusively let in islamic muslims
You have identified America's true enemy with that statement.