I don't need to. I work in logistics. I manage freight alongside the border.
There are plenty of places where youd be annexing huge chunks of Mexican cities.
Have you ever even driven across another state? You seldom hit a city immediately when you cross over. It'll be about 5-10 miles until you start hitting the Mexican city limits across most of the border.
So yes, we should seize 3 miles of all the border immediately south of the existing border and build the wall. That would bypass all of the courts and environmentalists stopping it.
You must be joking. Yes, I’ve driven coast-to-coast many times... As for border distances, for example, go to El Paso and then try to tell me with a straight face that you can go “5-10 miles until you start hitting the Mexican city limits.”