Seems to me anyone who has been in a country long enough to put down firm roots should be deemed legal.  The whole business of rules as to who can enter and who cannot is at root racism anyway and Trump is playing a racist card if he not not actually a racist himself.

If you insist on "justice" and therefore a penalty for the illegal entry, then impose a reasonable fine (let the punishment fit the crime).  America has, just as it also has with things like drugs and gambling, created a criminal class of non-criminals.  If they commit real crimes put them in jail, whether they were born in the States or not.  Twenty to forty million people just cannot be deported, and cannot be allowed to continue festering as a permanent under-class subject to exploitation by real criminals.  Have some sense, Americans, and stop being so self-righteous.