Live testimony from the impeachment hearings in Washington, where William B. Taylor, who was America's top envoy to Ukraine, will be testifying along with George Kent, a seasoned top State Department official who has served under five presidents. They are expected to allege that Trump ordered vital military funding and the promise of a meeting with the Ukrainian president be withheld unless Ukraine announced an investigation into the Bidens.

Here's a guide to what they'll be asked about and why it matters: https://www.cbc.ca/1.5354018

»»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS

Connect with CBC News Online:

For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX
Find CBC News on Facebook: http://bit.ly/1WjG36m
Follow CBC News on Twitter: http://bit.ly/1sA5P9H
For breaking news on Twitter: http://bit.ly/1WjDyks
Follow CBC News on Instagram: http://bit.ly/1Z0iE7O

Download the CBC News app for iOS: http://apple.co/25mpsUz
Download the CBC News app for Android: http://bit.ly/1XxuozZ

»»»»»»»»»»»»»»»»»»
For more than 75 years, CBC News has been the source Canadians turn to, to keep them informed about their communities, their country and their world. Through regional and national programming on multiple platforms, including CBC Television, CBC News Network, CBC Radio, CBCNews.ca, mobile and on-demand, CBC News and its internationally recognized team of award-winning journalists deliver the breaking stories, the issues, the analyses and the personalities that matter to Canadians.