Ukraine's investigation into whether Marie Yovanovitch was under illegal surveillance before she was recalled from her post follows the release of documents in the US showing associates of President Trump's lawyer communicating about her removal.
Marie Yovanovitch testifies in the second public hearing even as US president launches Twitter attack on her during the testimony, dubbed "witness intimidation" by Democrats.
Marie Yovanovitch, the ousted US ambassador to Ukraine, and Michael McKinley, a former top aide to Secretary of State Mike Pompeo, recount mounting concerns about the Trump administration's actions toward Ukraine in hundreds of pages of transcript.
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