I'm referring to any child forced to attend public school.
I get your objection to foreigners attending our public school. I wish that Trump had kept his promise to build the Wall, so they could not stream over our border. Illegal immigration greatly harms the U.S., especially our public education system.
But I have to take issue with the term "uninvited."
While the border is supposedly "closed," it has long been the unofficial policy of the U.S., across multiple administrations and congresses dominated by each party in turn, to allow and invite illegal immigration. If that were not so, illegal immigration would not be so prevalent. That policy has often been made official, as with the various amnesties and moratoriums on enforcement.
If we want to say that children of illegals don't have to go to school, or are not allowed to go to school, since they can just be landscapers, maids, and construction workers like their parents, fine. They will be better off as maids in the U.S. than as farm-workers in Latin-America. If that is the policy, that is the policy, and public school need not worry about them.
But as long as we send the children whose parent we invited to violate our border to public schools, it is foolish and wasteful not to make sure that they are ready to learn.