President Donald Trump on Tuesday signed a memorandum that aims to bar undocumented immigrants from being counted in the 2020 census for the purpose of determining U.S. House seats, a constitutionally questionable move that civil libertarians say they will challenge in court. The U.S. Constitution says House districts should be based on the “whole number of persons in each state,” which courts have interpreted to mean all people regardless of immigration status. A 2016 Supreme Court ruling said the Constitution requires the use of total population to allocate House seats among the states. source