President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE harshly criticized the tenure of former U.S. Ambassador to Ukraine Marie Yovanovitch Marie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security MORE as she testified at a House impeachment hearing and emphasized he had the right to remove her from the post.

Trump asserted that “everywhere” Yovanovitch served “turned bad,” and noted that Ukrainian President Volodymyr Zelensky spoke negatively of her during their July 25 phone call.

“Everywhere Marie Yovanovitch went turned bad. She started off in Somalia, how did that go? Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him. It is a U.S. President’s absolute right to appoint ambassadors,” Trump tweeted.

Everywhere Marie Yovanovitch went turned bad. She started off in Somalia, how did that go? Then fast forward to Ukraine, where the new Ukrainian President spoke unfavorably about her in my second phone call with him. It is a U.S. President’s absolute right to appoint ambassadors. — Donald J. Trump (@realDonaldTrump) November 15, 2019

“They call it ‘serving at the pleasure of the President.’ The U.S. now has a very strong and powerful foreign policy, much different than proceeding administrations. It is called, quite simply, America First!” Trump continued.

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Trump then claimed he has done “FAR more” for Ukraine than former President Obama.

Asked to respond to Trump's criticism at the hearing later Friday morning, Yovanovitch said the tweets were "intimidating."

“I can’t speak to what the president is trying to do, but I think the effect is to be intimidating," Yovanovitch replied when asked about them by House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.). Schiff then said the committee takes witness intimidation "very seriously."

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Yovanovitch also defended her tenure at the State Department, saying she believed she and others "have made things demonstrably better for the U.S. as well as for the countries that I’ve served in.”

Later, the White House pushed back on Schiff's accusation that Trump was intimidating a witness.

"The tweet was not witness intimidation, it was simply the President’s opinion, which he is entitled to," said White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE.

"This is not a trial, it is a partisan political process — or to put it more accurately, a totally illegitimate, charade stacked against the President. There is less due process in this hearing than any such event in the history of our country. It’s a true disgrace,” she added.

Yovanovitch, a career foreign service officer who has served in Republican and Democratic administrations, was abruptly recalled from her ambassadorship by Trump in the spring after the president’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE and his allies engaged in a smear campaign to oust her, according to testimony in connection with the impeachment inquiry.

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Deputy Secretary of State John Sullivan said that Trump had lost confidence in Yovanovitch at the time of her ouster. Sullivan has said she did nothing wrong.

House Democrats called Yovanovitch to testify on Friday about her ouster, which preceded an effort by Giuliani to get Ukraine to pursue investigations that could benefit Trump politically. House Democrats are investigating whether Trump abused his office to pressure Ukraine to pursue the investigations, which he raised on the July 25 call with Zelensky.

Trump also raised Yovanovitch during the call, describing her as “bad news” and saying she was “going to go through some things.” Zelensky also later told Trump he agreed she was a "bad ambassador."

Yovanovitch testified Friday that she felt threatened when she saw Trump had raised her on the call.

“I was shocked and devastated,” she said. “It was a terrible moment.”

-- Updated at 1:47 p.m.