The deportation bit, however, is a straw man argument. There's no need to deport all the illegals (other than criminals, who Trump's plan goes after - what do you think the tripled number of ICE agents is for?)
Take away the incentives to stay: No work, no welfare, revoke birthright citizenship, etc., and most will leave, taking their kids with them.
Your last sentence is what donnie took from the cruz long time plane. Actually since 2011.