William Taylor and George Kent, who have already spoken at closed hearings, will give public evidence on Wednesday.
Members of the House Intelligence Committee are preparing to hold the first public hearing in the investigation into the impeachment of President Donald Trump.
William Taylor, who heads the US Embassy in Ukraine, and George Kent, the Deputy Assistant Secretary of state for European and Eurasian Affairs, will give public testimony on Wednesday.
Both Taylor and Kent are among former and current officials who have already testified at closed hearings in recent weeks.
Committees of the House of Representatives have published transcripts of their testimony. Witnesses gave details of how Trump and his cronies tried to persuade Ukraine to launch an investigation into one of the President’s main political rivals, Democrat Joe Biden, and his son Hunter, as well as to test the now-debunked theory about Ukrainian interference in the 2016 election.
Trump on Monday called the investigation a “completely lopsided witch hunt” and said he could release a transcript of his first conversation with Ukrainian President Vladimir Zelensky, which took place in April, shortly after Zelensky was elected.