As Democrats celebrate their historic gains, Republicans are beginning to take stock of major upsets and what comes next for their party. Amna Nawaz speaks with former Arizona Sen. Jeff Flake, one of the most outspoken Republican critics of Trump during his first administration and the author of the 2017 book “The Conscience of a Conservative.” Amna Nawaz: As Democrats celebrate their historic gains, Republicans are beginning to take stock of major upsets and what comes next for their party.