Funny thing is that he is going to make Mexico build it. Which equates to the following:
1. Construction jobs that would have given good, quality wages to AMERICANS will now go to Mexicans (hmm....where have I heard that before???)
2. American construction companies will probably be included (either directly or indirectly), and will still make millions from this project, but pay Mexicans 1/2 of what American workers would (again....hmmm....where have I heard this before???)
So I guess Trump isn't too much different than anyone else.