Both Kent and Taylor testified about their concerns about her ouster as the President's lawyer, Rudy Giuliani, took a leading role on Ukraine policy.

Despite Trump's daily denials, Schiff said that the witnesses will show that "the most important facts are largely not contested" in the inquiry.

The Democrats are investigating Trump's requests for allegedly politically motivated probes by Ukraine as the US withheld military aid from the country.

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Trump, backed by Giuliani, asked new Ukrainian President Volodymyr Zelensky in a July telephone call to probe Trump's political rival Joe Biden and his family and also to investigate Ukraine's possible role in the 2016 presidential election.