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: cbc.ca/1.5354018

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