Due to a technical issue, about a minute is missing from this video during the opening statements. We will correct this with a new, full version of the event and a link will be provided here.
Find more from PBS NewsHour at https://www.pbs.org/newshour
Subscribe to our YouTube channel: https://bit.ly/2HfsCD6
PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts