What's your source for the 31 bombings claim. As for the levy, well that is easier said that done. Mexico will immediately retaliate with similar tariffs to recoup the already recouped wall costs and so it will go on.
The problem for Trump is he has to find billions to start and finish it, there is no guarantee GOP will vote for it. Even if they do it's hundreds of billions for basically fuck all but an eyesore and an embarrassment to every non, red neck/ racist /thick, gun loving, Jesus worshipping, Muslim hating, immigrant avoiding, flag loving, sexual assault forgiving, disabled mocking, Americans. Never heard a supporter of trump who wasn't at least six of those things.
Is there even an artists impression of the thing?