Staffer overheard Trump ask Sondland about ‘investigations’- Taylor

Democrats leading the U.S. House of Representatives probe have summoned three U.S. diplomats – all of whom have previously expressed alarm in closed-door testimony about Trump's dealings with Ukraine - to detail their concerns under the glare of wall-to-wall news coverage.

Trump's fellow Republicans, who will also be able to question the witnesses, have crafted a defense strategy that will argue he did nothing wrong when he asked Ukraine's new president to investigate Joe Biden, a former vice president and key 2020 re-election rival.

The day's two witnesses - William Taylor, the top U.S. diplomat in Ukraine, and George Kent, the deputy assistant secretary of state for European and Eurasian affairs - followed with opening statements echoing their earlier closed-door testimony about their alarm over efforts to get Ukraine to open an investigation of Biden.