Yet this is exactly the approach the Trump administration wishes to take in 2020. Why? In announcing the decision Monday, Commerce Secretary Wilbur Ross said the question should help identify possible voting rights transgressions. In other words, a district where the minority voter turnout doesn’t match the minority population requires the further explanation of the local residents’ legal status before deciding whether to target it for remedies authorized by the Voting Rights Act. This is, of course, ridiculous. The government already does regular surveys that judge, among other things, the citizenship status of localities based on samples of the population. We already have a pretty good idea where undocumented immigrants live, and so does the Trump administration, which is what makes it so clear what the actual motivation is: messing with congressional districts.