I understand you to say you believe that Trump has consistently wanted to return illegal immigrants.
Trumps previous statements do not support that view. Of course, I am talking about when Trump was giving money to the Clinton's and bragging on Bill, Hill, and Obama.
He is talking about them re-entering the country legally. I do not think that many will come back because of the fairly rigorous legal immigration process and requirements. Trump has been married to foreign citizen wives and he knows the process. I suspect that he knows that unless Congress changes the process greatly, most of the illegals will not be coming back. I have experienced the legal immigration process as I had to go through it with my German wife when I married her. It is not fast, cheap or easy. Among other requirements there was a local country police record check with fingerprints, a thorough medical screening by an embassy designated doctor and many other forms to fill out and file. I had to pay for it all and the filing fees, etc. do add up. There was also a requirement that I had to prove I could support my wife and she would not be a burden on the state. I had to sign an affidavit that she would not draw any public support for 10 years or I would be liable for it. After all of that is submitted to the embassy, the US does its own checks and schedules interviews. If everything goes as well as it can, the process takes 1-2 years and costs a couple grand, not including your time or travel to the nearest embassy/consulate and associated expenses. I do not look for the majority the illegals to go through all of that and I suspect that between the medical screening, proof of support and various police checks that many will not qualify anyways. Here is a link to the state.gov that describes the process more completely. http://travel.state.gov/content/visas/en/immigrate/immigrant-process.html
Believe it or not, we actually have fairly strict immigration laws. They have simply not been applied to illegals for the past few decades.