Shields and Salam on China tariff tit-for-tat.

Syndicated columnist Mark Shields and National Review executive editor Reihan Salam join Judy Woodruff to discuss the week’s news, including President Trump’s escalating calls for tariffs on Chinese imports, the decision to deploy the National Guard to the U.S.-Mexico border, ethics concerns for EPA Administrator Scott Pruitt and the legacy of Martin Luther King Jr. 50 years after his death.