What does an archaic 1853 treaty regarding the Veracruz railroad have to do with building a border fence? The fence won't block the railroad.
Not much, if we are willing to trash our Constitutional Republic. Otherwise, the President must seek concurrence from two thirds of the Senate to nullify the treaty. In my opinion this was a late night "deal" to mollify the public. No more, no less. Good PR for the Republican party, no doubt. My stance is simple. Such a maneuver for political gain is inappropriate. Else the "opposition" (joke) would have stalled it. IMHO it is a bipartisan ploy to garner votes. On both sides of the aisle.
If we are indeed suffering an invasion, and the "War on Drugs" (and illicit smuggled weapons and sex slaves) is a failure; please explain to me why we allow our finest men and women to give the ultimate sacrifice for zero benefit. Simply put, when a muddy creek and some barbed wire can not be controlled; too many "conservatives" demand to throw money at the problem.