Her testimony is part of an impeachment inquiry against the USA president.
In a 10-page statement obtained by The New York Times and The Washington Post, Yovanovitch defended her tenure and decried the "concerted campaign" to recall her from Ukraine, which she said is tied directly to President Donald Trump. "I departed Ukraine for good this past May", she said.
The chairmen said efforts by the Trump administration "will be deemed obstruction" in their impeachment inquiry.
Marie Yovanovitch, the former ambassador to Ukraine who was recalled in May after butting heads with the White House, told members of the committees leading the impeachment inquiry into President Trump on Friday that her removal was "based, as far as I can tell, on unfounded and false claims by people with clearly questionable motives".
So it was surprising and exciting when Marie Yovanovitch, the former ambassador to Ukraine, appeared on Capitol Hill today without having to be subpoenaed.
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"Equally fictitious is the notion that I am disloyal to President Trump", Ms Yovanovitch said.
"Although I understand that I served at the pleasure of the president, I was nevertheless incredulous that the U.S. government chose to remove an ambassador based, as best as I can tell, on unfounded and false claims by people with clearly questionable motives", she said in a prepared statement.
The former USA ambassador to Ukraine, Marie Yovanovitch, has delivered a stinging denunciation of diplomacy under the Trump administration, saying the state department was being "attacked and hollowed out from within".
The State Department did not immediately respond to a request for comment by The Epoch Times. "But we are concerned that Schiff is putting her a precarious position by having her testify in secret without State Department lawyers be present".
The Democratic probe is looking into whether Mr Trump improperly pressured Ukraine to investigate his political rival Joe Biden. "I have received notice of concrete evidence from close companions that Ambassador Yovanovitch has spoken privately and repeatedly about her disdain for the current Administration in a way that might call for the expulsion of Ms. Yovanovitch as U.S. Ambassador to Ukraine immediately".
On Thursday, two Florida businessmen - Ukraine-born Lev Parnas and Belarus-born Igor Fruman - who had helped Giuliani as he investigated Biden were arrested in what USA prosecutors said was a scheme to illegally funnel money to a pro-Trump election committee and other political candidates. Add Impeachment Inquiry as an interest to stay up to date on the latest Impeachment Inquiry news, video, and analysis from ABC News. "He has no agenda apart from answering the Committees' questions fully and truthfully". She called on both Congress and the State Department to act, saying "I fear that not doing so will harm our nation's interest, perhaps irreparably".
"Ambassador Sondland hopes the materials will be shared with the Committees in advance of his Thursday testimony", they said in a statement. Not only did she appear for her scheduled deposition, but boy did she have a lot to say.