It specified no concrete
This Omnibus Thing has the words “no concrete border wall” in it?
Trump prolly has a plan in his pocket
My concept from many months ago.
A two step process.
1) Build a tall “fence”. Drive the supporting poles into the ground. Connect the poles with rebar.
2) Later, get the money for concrete. Erect forms on both sides of the poles, and start pouring concrete.
http://www.madehow.com/Volume-6/Skyscraper.html
6 Concrete is often used for constructing a building’s core, and it may also be used to construct support columns. A technique called “slip forming” is commonly used. Wooden forms of the desired shape are attached to a steel frame, which is connected to a climbing jack that grips a vertical rod. Workers prepare a section of reinforcing steel that is taller than the wooden forms (aka the fence just authorized by congress). Then they begin pouring concrete into the forms (Mexico pays for this part, then they pay for the steel frame). As the concrete is poured, the climbing jack slowly and continuously raises the formwork. The composition of the concrete mixture and the rate of climbing are coordinated so that the concrete at the lower range of the form has set before the form rises above it. As the process continues, workers extend the reinforcing steel grid that extends above the formwork and add extensions to the vertical rod that the climbing jack grips. In this way, the entire concrete column is built as a continuous vertical element without joints.