You've been listening the the uninformed who don't have a clue what he wants to do.
He wants to let Mexicans work legally in the US and keep the illegals out.
There will never be a full scale round up of illegals but if the atmosphere is too hard to hire illegals then they try to get here as legal guest workers.
It's a full reform not amnesty !
We'll see, I guess. Nothing gets reformed without full closure of the borders.