President Trump is calling for a new census that would take the unprecedented step of excluding undocumented immigrants for the first time. As mandated by the Constitution, the census is conducted every 10 years and counts all U.S. residents regardless of their immigration status, since the 14th Amendment requires the “whole number of persons in each state” to be included. It’s unclear whether Trump will attempt to move up the census from 2030 to an earlier date.