There should be no legal penalty for not answering the citizenship question, because the question shouldn't be on the census to begin with. The reason for asking it is purely political. Given this administration's extreme hostility to immigration, period, it would be understandable that even legal immigrants would be hesitant to respond. The goal of asking the question is to deliberately undercount the population in areas with high concentrations of immigrants, thereby reducing representation of those areas in the House. It would also reduce federal spending in those areas due to deliberate undercounting. How do we accurately count the citizen children of undocumented parents, if the parents are afraid to fill out the census?Furthermore Immigration and SSA already can provide numbers of legal immigrants already.