Whether or not the influx of millions of illegals across the southern border is an invasion in constitutional terms, it certainly is an invasion in common parlance. And for a border state like Texas, it is a comprehensive disaster. The people of Texas plainly have a right to defend themselves against this evil. If being part of the Union makes it legally impossible to defend themselves, it is only right that they should consider whether they want to remain in the Union. This is doubly true if the problem arises from a malicious determination on the part of the federal government to abandon, indeed subvert, one of the basic responsibilities that Texas and other states have delegated to that government.