A lawyer for Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian MORE, a Ukraine specialist on the National Security Council, sent a warning letter to Fox News on Wednesday, asking the network to retract espionage allegations that were made by network guest John Yoo and "sparked a torrent of republications and copycat false charges."

The segment in question aired on the Oct. 28 edition of "The Ingraham Angle."

During the segment, host Laura Ingraham Laura Anne IngrahamTrump assails Black Lives Matter in appeal to Black voters Ex-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus Sean Hannity and Lou Dobbs to be deposed in Seth Rich lawsuit: report MORE told John Yoo — who was a top attorney for the George W. Bush administration — "We have a U.S. national security official who is advising Ukraine, while working inside the White House, apparently against the president’s interest, and usually, they spoke in English."

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"Isn’t that kind of an interesting angle on this story?” Ingraham asked Yoo.

Yoo replied: "I found that astounding. Some people might call that espionage.”

Ingraham didn't agree with Yoo, but the letter notes she also didn't refute his comments.

According to the letter, "The viewer was left to understand that Ms. Ingraham, an attorney and former Supreme Court clerk, and her law professor guest [Yoo] must have had a factual bias for concluding that LTC Vindman had engaged in espionage against the country he has sworn to protect. They did not."

"Reactions to the Segment quickly confirmed it was universally understood to accuse LTC Vindman of espionage against the United States," the letter continued.

Yoo wrote an op-ed in USA Today several days later, in which he said he walked back his comments while admitting that he "really stepped in it."

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In a statement a Fox News official told The Hill, "As a guest on FOX News, John Yoo was responsible for his own sentiments and he has subsequently done interviews to clarify what he meant.”

Vindman testified publicly Tuesday as part of the House's impeachment inquiry. He clashed with Republicans during the hearing of the Intelligence Committee and provided a firsthand account of the July 25 call between 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 and Ukraine President Volodymyr Zelensky.

David Pressman, Vindman's attorney and author of the letter, also highlighted a tweet Ingraham posted Tuesday, in which she commented, "Why would Ukraine offer the post of defense minister to a U.S. gov't official working in their region? What does that reveal, if anything, about how Ukraine perceived him?"

Why would Ukraine offer the post of defense minister to an U.S. gov’t official working in their region? What does that reveal, if anything, about how Ukraine perceived him? — Laura Ingraham (@IngrahamAngle) November 19, 2019

The tweet echoed a line of questions from Tuesday's hearing, during which GOP counsel Stephen Castor probed Vindman on Ukrainian offers to make him the nation’s minister of defense, asking if Vindman “left the door open” to accepting these offers.

Vindman rejected the idea.

Pressman also wrote, “LTC Vindman and his family have been forced to examine options, including potentially moving onto a military base, in order to ensure their physical security in the face of threats rooted in the falsehood that Fox News originated."

"As the self-described 'most watched, most trusted' news network, Fox News has a grave responsibility to the truth. The Segment was not true. It has now been repeated by some of the most powerful people in the world. It is causing great pain. We ask you to retract the coverage, correct the record, and publish the truth," the letter concludes.