When mayor after mayor and governor after governor have forbade the police, teachers, welfare workers, doctors, nurses, and just about everyone else, from turning in known illegals, what do you think this president or any other could have done? And please don't tell me that he should have prosecuted every single one of them. That goes beyond his authorized powers.
Why nothing. Nothing at all.
Specifically, what problem is 100 years old? Are you referring to the impact on our hospitals, jails, schools, traffic, crime, social services etc?