Tamara Keith and Amy Walter on impeachment trial witnesses, Iowa polls

NPR’s Tamara Keith and Amy Walter of the Cook Political Report join Judy Woodruff to discuss the latest political news, including whether enough Senate Republicans will vote to hear witnesses in the impeachment trial of President Trump and how 2020 presidential candidates are polling and campaigning in Iowa as its Democratic caucuses approach. Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG Find more from PBS NewsHour at https://www.pbs.org/newshour Subscribe to our YouTube channel: https://bit.ly/2HfsCD6 Follow us: Facebook: http://www.pbs.org/newshour Twitter: http://www.twitter.com/newshour Instagram: http://www.instagram.com/newshour Snapchat: @pbsnews Subscribe: PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts Newsletters: https://www.pbs.org/newshour/subscribe