I am not necessarily advocating for their deportation. But they would have to do what is necessary to regularize their status. For long term ones that are employed, i would suggest fines and community service. But if they are people we really don’t want here, with a criminal record, or long term dependence on government services, than they need to be sent home. We should be able to pick and choose who comes here.
Ever hear of Ellis island? Only a very small percentage of people were denied entry, and first and second class passengers were not even sent there, they were processed aboard their ship. My great grandfather was one of those, he arrived in Baltimore on a sec class ticket,and had training as what we would now call a civil engineer. But we did reject those that the government of the time thought undesirable. I am in favor of immigration. It just needs be done in an orderly manner, with entry given to most who apply and meet some sort of criteria. In the days of Ellis island, it was twenty dollars, or in lieu of that family already here.
BTW, I think I know the rest of th,e story about the Mennonite farmers that had an unfortunate experience in Kansas. If I recall correctly, the newspapers of the time considered them highly desirable immigrants, for they were skilled farmers.