Only citizens and legal residents should be counted by the Census.
Persons who entered the United States illegally lack legal standing in the United Sttes.
Persons who overstay visas lose legal standing when the visas expire.
How can persons who are not legally under the juridisction of the United States be counted towards apportionment?
If a Mexican is in Mexico, he is not counted by the US Census. If a Mexican is in the United States legally, he is under the jurisdiction of Mexico permanently, and under the Jurisdiction of the United States for the term of the visa. If a Mexican is in the United States illegally, he is solely under the Jurisdiction of of the Mexican Government.
How can a person soley under the Jurisdiction of a foreign nation be counted towards apportionment in the United States House of Representatives?