Well, you're being bamboozled again. There will be no 2,000-mile wall. Even TS admits that the "wall" is merely symbolic.
By "symbolic" I mean whatever will bring about more effective border control for given terrain, geography, circumstances.
Also when talking about illegal immigration, it is necessary to improve "interior enforcement" which is fancy talk for illegals that got across, and now reside in the US.
Visa overstays exceed border crossers, for the method of illegal immigration.
People walk across sectors of the deadly Sonora Desert to gain entry. Why take the risk? Because of high probability of success.
Change that probability, and fewer will risk the crossing.
Besides 2,000 miles of land border, there is even more distance with water borders on both coasts and the Gulf of Mexico. All forms of entry must be addressed.
Legal immigrants and native born Hispanics are among big supporters of improved border control & reduced illegal immigration.