Fuck’em. THe data about population and such should ONLY include citizens. This data is used to distribute federal monies (among other reasons)to states. Those states with a high illegal population should NOT get more federal money because of that population. (I’m thinking Kalofronica here). Cities too get money based on their population, and the same issues apply.
At the end of the day, the Census is designed to count CITIZENS, not just folks living here.