Elon Musk very smartly shows why Democrats want illegals in this country. 2 Ways they massively benefit the democrats. One, they are trying to legalize them so they can vote. And #2, which is even more important, the census only counts people, not citizenship. If you deport all the illegals in the country, blue states would lose seats on apportionment, beyond the amount they expect to lose in 2030 (which is 13 seats). If you deport all the illegals, then blue states will lose an additional 20 seats just due to the deportation.
Think what would happen if we deport all the illegals on top of the decline in blue states normally, in 2030, blue states could in theory lose 33 seats to apportionment. This would give red states a 100% certainty of winning POTUS elections going forward, as red states that always vote GOP would likely hit the magical 269 votes before every single election, before it even starts.