Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) is demanding that 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 appear before Congress and give her a definitive answer on whether 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's administration ever requested he investigate anyone.

The 2020 presidential candidate made the call just hours after the White House released a memo of a July phone call in which Trump pressured Ukrainian President Volodymyr Zelensky to work with Barr and Trump 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 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 and his son Hunter Biden over allegations of corruption.

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Harris, an outspoken critic of Trump and Barr, raised alarm over the developments, pointing to footage from May of the attorney general's congressional testimony regarding former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report.

"I asked Attorney General Barr in May: did the White House ever ask him to investigate anyone? He wouldn't answer," she said on Twitter. "Barr needs to come back to Congress and answer that question again. Under oath."

I asked Attorney General Barr in May: did the White House ever ask him to investigate anyone? He wouldn't answer.



Barr needs to come back to Congress and answer that question again. Under oath.



This time, he better have an answer. https://t.co/ybObJ1GC53 — Kamala Harris (@SenKamalaHarris) September 25, 2019

During a Senate Judiciary Committee in May, Harris appeared to catch Barr off guard when she asked him whether the White House had ever asked or suggested he open up an investigation into anyone.

Barr hesitated, before asking the senator to repeat the question. He later said he was being cautious because he was "trying to grapple with the word 'suggest.'"

“There have been discussions of, of matters out there that, uh — they have not asked me to open an investigation," he said.

Just days later, Harris wrote to the Department of Justice's (DOJ) inspector general calling for a probe into whether Barr had been pressured by Trump or White House aides to open criminal investigations. The senator called Barr's reply to her question an "alarming response" that threatened to undermine the agency's independence.

Reports first surfaced last week that Trump pressured the Ukrainian president to investigate Biden and his son. A memo from the White House released earlier Wednesday showed Trump on multiple occasions talking with Zelensky about working with Barr to look into the Bidens.

The phone call occurred around the same time that the White House delayed millions of dollars in military aid to Ukraine, raising speculation from Democrats as to whether the president used the aid as leverage.

The Justice Department said in a statement following the memo's release that it declined to pursue an investigation into the matter because Trump's comments did not amount to a campaign finance violation.

Trump has acknowledged speaking with Zelensky about Biden, but has denied addressing military aid in their talks.

The July phone call is said to be at least part of an intelligence community whistleblower complaint.