Four witnesses testified in the impeachment hearing. The first two were the first to testify with firsthand knowledge of the president's phone call with the Ukrainian president. The second two were called by Republicans to support their claims. In this episode: White House correspondent Tamara Keith, national political correspondent Mara Liasson, and national security editor Phil Ewing.Connect:Email the show at nprpolitics@npr.org.Join the NPR Politics Podcast Facebook Group.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.