Next step: cancel all tourist activity in Mexico. Advise all Americans the travel in Mexico is dangerous and that Americans will not be allowed to travel there. Next step: stop all foreign aid going to Mexico. Next step: embargo all products produced in Mexico. Next step: stop all daily crossings of Mexican nationals into this country on the border states.
Do you see where I'm going on this?
Also, we'd have to call back all our expats living in mexico and demand Amb. Garza divorce his wife; hopefully they haven't spawned.
...UN sanctions?