Coming Up on 'This Week': Senate Majority Leader Mitch McConnell

George Stephanopoulos goes one-on-one with Senate Majority Leader Mitch McConnell, R-Ky., and Sen. Dianne Feinstein, D-Calif., Sunday on “This Week.” Plus, Robert Sumwalt of the National Transportation Safety Board discusses the latest on the investigation into the deadly Amtrak derailment that killed eight people this week. Then we talk with former CIA deputy director Michael Morell, author of the new book “The Great War of Our Time.” And the powerhouse roundtable debates all the week’s politics, with ABC News' Matthew Dowd, Jonathan Karl, Ana Navarro, and Cokie Roberts. See the whole political picture, Sunday on “This Week.”