What Donald Trump’s impeachment trial means for U.S. political institutions
As former U.S. president Donald Trump's impeachment trial gets underway this week for his role in inciting the U.S. Capitol attack, some say the country's political institutions are at stake. To unpack the issue, Matt Galloway speaks with Ken Mack, the Lawrence D. Biele professor of law and affiliate professor of history at Harvard University, and Karen Tumulty, a political columnist for the Washington Post.