President Donald Trump announced Thursday that he was ordering a new United States census that would exclude undocumented immigrants, arguing that it's unconstitutional to count them despite courts regularly holding that the census must count everyone, regardless of immigration status.

With estimates on the undocumented population varying widely, from around 11 million to as high as 20 million, just how big is the U.S. population, and just how much impact are undocumented migrants having on the wider, legal population ?

"Congressional representation is a zero-sum proposition. When one state gains a seat in Congress due to the presences of illegal aliens, American citizens in another state necessarily lose representation," Ira Mehlman, media director at the anti-immigration Fede

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