He spoke about this in the past. The easiest part is stopping more illegal aliens from sneaking in here. Getting rid of people and families already here who are working, part of a community, not real criminals and want to be Americans - not so easy.
Realistic is securing the border first.
Cruz and Trump have both made this statement.
Idealistic is rounding up the 30 million and have them build the wall from our side and finish it up on their side.
I have a dream, I am an American dreamer and I said this.
But that doesn't do much, since the rate of them coming has slowed down, and 60 million illegals are already here. Stopping more from coming is barely even a bandaid.