I wonder what would would happen if millions of citizens refused to comply with the census...
They would have their representation further diluted by people who are profiting from their crimes.
Then the states in which they lived, would be (potentially) allocated fewer House of Rep seats.
For example, if most of the roughly 4.75 million (R) registered voters in CA [1] did not participate in the Census, CA probably would loose a seat or two. Unless, of course, a near equal number of illegal aliens were counted.
If the citizenship question does not make it to the 2020 Census due to timing, then this might very well have to be a movement in the blue states that (R)'s need to undertake.