Shields and Brooks on Trump and race, Democrats' 2020 values

Syndicated columnist Mark Shields and New York Times columnist David Brooks join Judy Woodruff to discuss the week’s political news, including President Trump’s personal attacks on Democratic Rep. Elijah Cummings of Maryland and other lawmakers of color, the significance of a wave of Republican congressional retirements and how the 2020 Democrats fared in the two-night debate in Detroit.