Marie Yovanovitch was stripped of her senior diplomat position by Trump card administration earlier this year. Yovanovitch defended his anti-corruption record during the hearing. She claimed that her removal had left US policy there in disarray.
As she testified, Trump bombarded Twitter with criticism of her.
He said: “Everywhere Marie Yovanovitch was feeling bad.
"She started in Somalia, how was it?"
House Democratic Intelligence Committee chairman Adam Schiff asked Yovanovitch for his reaction to the tweet.
She replied that she found it "very intimidating".
Yovanovitch added, "I can't talk about what the president is trying to do, but I think the effect is intimidating."
Schiff replied, "Well, I want to inform you, Ambassador, that some of us here take witness intimidation very, very seriously."
House Speaker Nancy Pelosi He was asked if the tweet was from classes as a witness to bullying.
"Let's go. Why would we start making this judgment now?"
During a call with the Ukrainian President Volodymyr zelenskyTrump described Yovanovitch as "bad news."
The report of one liaison whistleblower triggered the impeachment inquiry.
Yovanovitch described the moment he read the memo of the conversation.
She said: "I was shocked and devastated to join a phone call between two heads of state in this way, where President Trump said I was" bad news "to another head of state.
"A person who saw me reading the transcript said the color faded from my face, I think I even had a physical reaction.
"Even now, the words kind of fail me."
The impeachment investigation ended with Trump claiming to have acquitted the power of his office by pressuring Zelensky to investigate a political rival, former Vice President Joe Biden.