The Buffoon tried this in 2020 it was ultimately shot down by the Supreme Court largely on procedural grounds. www.scotusblog.com

Conducting a census before the midterms is problematic in that the Census Act requires the proposed questions be submitted to Congress two years before the census date. www.census.gov

Excluding noncitizens contravenes the Fourteenth Amendment Section 2 first sentence.

Representatives shall be apportioned among the several States according to their respective numbers, counting the whole number of persons in each State, excluding Indians not taxed.