"This new question, if it becomes a part of the 2020 Census, will deter participation by immigrants across the country, who do not want an official record of their immigration status and fear that their responses will be used by the government to harm them and their families…."
https://www.theusconstitution.org/news/release-new-issue-brief-census-clause-constitutional-obligation-count-persons/
the count MUST be accurate, anything that may make that not so, should not be included.