Trump will get the wall built, as it has proven extremely effective on the California border. He will get some payment from Mexico, most likely a 1 - 5% tax on net imports, which over 3-6 years will pay for it. I for one want LEGAL, VETTED immigrants who have gone through the system, to immigrate to the US. My ancestors did and I am better for it. 
Every illegal immigrant that jumps the line and comes into the country is breaking the law that has been on the books forever and no president after Eisenhower has enforced. This wall will not only keep out illegals, it will help cut down on the drug trade. I personally know a person from Eastern Europe who flew to Mexico and paid a mule to cross the border. Nice person but he has taken a job that a high school graduate should have gotten.