President Donald Trump suggested Monday he might be willing to offer written testimony in the House impeachment inquiry over whether he pressured Ukraine's president to investigate Joe Biden and his son while withholding aid to the country.
"I did not think it was proper to demand that a foreign government investigate a USA citizen, " said Vindman.
Gordon Sondland, Mr Trump's ambassador to the European Union, is among the only people interviewed to date who had direct conversations with the President about the situation because the White House has blocked others from cooperating with what it dismisses as a sham investigation.
Trump has said the Mueller investigation cleared him of allegations of obstruction of justice.
The public phase of hearings shifts into higher gear this week when a parade of officials will face questioning by Democratic lawmakers seeking details that could link Trump to a pressure campaign against Ukraine.
National Security Council Ukraine expert Lt. Col. Alexander Vindman and Jennifer Williams, an aide to Vice President Mike Pence arrive to testify during the House Intelligence Committee hearing, into President Donald Trump's alleged efforts to tie USA aid for Ukraine to investigations of his political opponents, on Capitol Hill in Washington, D.C. on November 19, 2019.
Col. Alexander Vindman arrives to testify before the House Intelligence Committee.
Democrats have accused Mr Trump of using the frozen aid and Mr Zelenskiy's desire for an Oval Office meeting as leverage to pressure a vulnerable USA ally to dig up dirt on political adversaries. The money, approved by the US Congress to help US ally Ukraine combat Russia-backed separatists, was later provided.
The investigation could lead the House to approve formal charges - known as articles of impeachment - against Trump that would be sent to the Republican-controlled Senate for a trial that could result in his removal from office.
Diplomat David Holmes will testify on Thursday, the House Intelligence Committee said. He said he had been surprised and troubled by what was said on the July 25 call between Trump and Zelensky.
United States President Donald Trump says he likes the idea of testifying in relation to impeachment hearings and will "strongly consider it".
"So he's gonna do the investigation?" He complained that when he returned from Walter Reed, the first lady asked him "Darling, are you OK?"
Sondland called Trump as they dined at a Kyiv restaurant for lunch.
Trump was referring to Rep. Al Green, D-Tex., one of the first Democrats to express support for impeaching Trump.
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