You are mixing two separate issues.
Regardless of the issue with Mexican relations, the States Right Issue is still there. In addition to Texas and the border there are other States Rights issues that become involved and need to be sorted out in a SCOTUS ruling.
Even the Mexican issue is actually bifurcated. There is the Mexican Government and there are the Cartels.
My desire is to send American drones with rockets to destroy Cartel compounds including everybody there. The war is thus confined to the Cartels and not Mexico in general. With cartels maimed or destroyed, relations with Mexico can take on a new path.
Maybe
Sell we will see. In any event, Mexico may be run entirely by Cartels who can destroy the elected Mecican government, they have accumu;ated so much power and money, they even have their own international envoys to China.
Whichi ever way ot goes, there will be war on the Sourhern border as the cartels attempt to continue their slave trade and drug trade on behalf of China, designed to destabilize the entire West coast of the United States.Getting ready for invasion. There are tens of thousands of Chinese illegals set to act.
We do not have much time. The shtf when Trump is elected.