Rappler's latest stories on Trump impeachment hearings
'It is improper for the president of the United States to demand a foreign government investigate a US citizen and a political opponent,' says Lieutenant Colonel Alexander Vindman, one of the witnesses
But it is unclear what kind of testimony US President Donald Trump has in mind
(UPDATED) Former US ambassador to Ukraine Marie Yovanovitch testifies before US Congress about intimidation from Trump and the 'smear campaign' against her
Earlier witnesses in the inquiry said US envoy Marie Yovanovitch was removed after a smear campaign involving Trump lawyer Rudy Giuliani. Yovanovitch will now tell her side of the story.
The investigation threatens to make Donald Trump only the third US president to be impeached, after Andrew Johnson in 1868 and Bill Clinton in 1998
The hearings begin on November 13, with the first witnesses two officials who have already provided evidence against Trump in private testimony: Bill Taylor and Deputy Assistant Secretary of State George Kent