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 recalled then-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 this spring amid complaints from his supporters, including that she was stymying efforts to get Ukrainian officials to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, The Wall Street Journal reported on Thursday.

Trump's recall of Yovanovitch has been a focal point in Democrats' ongoing impeachment inquiry, which is largely centered around the president's July 25 conversation with Ukrainian President Volodymyr Zelensky, during which Trump called for a Biden probe while hundreds of millions of dollars in U.S. aid hung in the balance.

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Trump'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 told the Journal that Yovanovitch had shown anti-Trump bias in private conversations and was an obstacle to getting Ukraine to investigate Biden and his son, Hunter.

Additionally, Giuliani reportedly gave Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE a nine-page document — dated March 28 — that included a timeline of Biden's dealings in Ukraine. The document also described Yovanovitch as being "very close" to the former vice president.

Giuliani's role has come under fierce scrutiny after a partial transcript of the July 25 phone call released by the White House showed that Trump wanted Zelensky to coordinate with the former New York mayor — as well as with Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE — on the Biden investigation.

While Yovanovitch's departure in May from the eastern European country was framed as "planned” by the State Department, her tenure as ambassador was three months short of the customary three-year term.

A senior Ukraine official told the Journal that Yovanovitch "was doing everything by the book."

"I heard very bad things about her," Trump said when asked Thursday why he recalled Yovanovitch.

"And I don’t know if I recalled her or somebody recalled her, but I heard very, very bad things about her for a long period of time," he continued. "Not good."

Yovanovitch is scheduled to speak with House lawmakers next week amid their impeachment proceedings.