The U.S. Constitution is clear: every person counts. But in a country with a sordid history of voter suppression, tinkering with the decennial census has become the latest trick for undermining majority rule. And the usually mundane rite of enumeration was politicized like never before when President Trump tried to exclude undocumented immigrants from the census. Dale Ho, director of the ACLU’s Voting Rights Project, explains why that’s detrimental to the proper functioning of government. And illegal.