Obviously the courts do not run the executive branch but if you were paying attention during all the travel ban stuff, you saw that judges all over the country were issuing rulings and “stays” of the EO. That is what would happen with an EO to fund the wall. A liberal judge would immediately declare it unconstitutional.
Yes, and they should be ignored. They’re not the final authority or arbiter on the Constitution. It’s amazing how much damage has already been done to the separation of powers by kowtowing to these tyrannical pipsqueaks.