The text of the Constitution is clear about the Census:
Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers,
which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons.
as is the superseding 14th Amendment:
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.
And yet...
Trump signs order targeting undocumented immigrants in the US census
President Donald Trump
signed a presidential memorandum on Tuesday that would exclude undocumented immigrants from being counted in congressional districts when district lines are redrawn next year.
The memorandum marks the Trump administration's latest effort to change the way US populations are counted and advance the President's immigration agenda. And like previous efforts, the issue will end up in court.
"I have accordingly determined that respect for the law and protection of the integrity of the democratic process warrant the exclusion of illegal aliens from the apportionment base, to the extent feasible and to the maximum extent of the President's discretion under the law," the order states.
Even though no citizenship question is on this year's census, advocates worried lingering fears over the question would deter immigrants from responding and lead to shortfalls in funding for schools, roads and other community projects.
In addition, Geltzer said, the census doesn't currently ask whether someone immigrated illegally to the United States. "Presumably the Trump administration will have to rely on a hodgepodge of other records to guess the population they intend to use for apportionment."
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Trump's move is obviously unconstitutional. The people around him probably know it. Like his earlier failed attempt to add a citizenship question to the census, the intent is to scare people into not filling out the census.