It is not like this is a secret, you can find the clip of the NY Democrat on record saying that they need the immigrants for redistricting purposes. Basically, even if they can’t legally vote, they count in the census towards the population and thus the allocation of seats in Congress, so they need them to maintain Democrats power hold
Just in 2020, 3 seats were taken from Ohio, Alabama and Minnesota due to the counting of illegals in NY and CA and at current rate, it will be 4 to 6 seats in favor of Democrats that will be taken from other states purely due to illegal immigration. With every election coming down to 1 or 2 seats, this is significant. Now Biden alone has permitted approximately 1% of the US population (3M) to be grown by illegal immigrants just last year year (2M apprehensions and known getaways, 50% of that number is estimated unknown), largely in blue districts but supported/paid for by red districts. With the estimated continuous growth in those numbers this year, about 4% of the US population will have been ‘replaced’ by election time under Biden alone, similar numbers were posted by Obama.