Why citizenship question on the 2020 census is a big deal

The House Oversight Committee voted Wednesday to hold Attorney General William Barr and Commerce Secretary Wilbur Ross in contempt of Congress for not turning over documents related to the decision to add a citizenship question to the 2020 census. While President Trump defends the question, critics say it's intended to benefit Republicans politically. Judy Woodruff talks to NPR’s Hansi Lo Wang.