Because not once have you said anything that makes sense about this. How is importing millions of people here and then having American citizens throw gazillions of tax dollars into it for their housing, medical, food, schooling etc etc GOOD for the people here today? The answer is, it isn't. Its too fucking expensive counselor. That's not even taking into the crime factor.
There are countries around the world which have erected walls, it can be done and should be done here. Should have been done a long time ago. he also isn't the only person who has promoted or spoken about the need to build a wall on the southern border.
Yes, spoken like a true person that's never run anything or worked for corporate America. Will they (companies) spend every penny on it? No, but will they invest more in their work force, equipment, buildings etc etc. Yes, absolutely they will.
Yes, he said that what, ten years ago? Has he said anything about installing a universal healthcare system since he decided to run for office? No, he hasn't. Why? Because he listened to people advising him on why the free market offered better solutions. He has spoken extensively on what he'd like to see in place now, and the details are also up on his website.