citizenship data for use in voting rights act enforcement. >> and supporters like republican representative james comer of kentucky argue the citizenship question is necessary. >> every working taxpaying citizen should want to know how many people are living in the united states. your tax dollars go to things to build infrastructure, to do things like pay for education, pay for law enforcement. we need to know how many people are living here. >> people who work, career professionals, within the census bureau, have already said that during the last census in 2010, 1.5 million african-american and latino people were undercounted by the census and this will only increase that number. so why do you support it? >> i believe that every american is supposed to fill out the census. i believe that we should know if people that fill out the census are citizens are not. people ask me all the time, when you're talking about the wall, which is a huge subject. >> why are we -- i'm talking about the census, sir. >> listen. listen. when we're talking about the wall, people say, how many illegals are here? i don't know. nobody knows.