He wants to just deport the illegal immigrants who are criminals, not every illegal immigrant. He would never be able to deport millions of people. He wants to make this country safer by getting rid of the bad apples. We don't want the USA to end up like Germany or other countries in Europe that are getting ruined by BS. Unfortunately, people are convinced he is going to go Hitler on us and round up all illegals, and that's not what's going to happen. It's called fear mongering, and too many people are making a mountain out of an ant hill.
As for making the illegals legal, or tightening up the borders, I'm all for that. It shouldn't be a free for all. Like I said, we don't want to end up like Europe. You wouldn't leave your house unlocked, so that anyone could walk right in. It should be the same with our country.