A Senate Judiciary Committee hearing on border walls turned into a fight over the language President Trump used to describe Haiti and some African countries. Why does it matter so much to members of Congress? Also, Stephen Bannon is the first member of Mr. Trump’s inner circle to receive a grand jury subpoena in the Russia investigation. Guests: Julie Hirschfeld Davis, a White House correspondent for The New York Times; Michael S. Schmidt, an investigative reporter for The Times. For more information on today’s episode, visit nytimes.com/thedaily.