A lawyer for Colonel Vindman, the National Security Council’s Ukraine expert, sent a warning letter to Fox News on Wednesday seeking a retraction or correction of an October segment hosted by one of the network’s biggest personalities, Laura Ingraham, which baselessly suggested that the colonel, a decorated Iraq war veteran, might be guilty of espionage.

The letter sent by David Pressman, a partner at Boies Schiller Flexner, the law firm run by David Boies, also highlighted inflammatory statements made on the network by others, including President Trump’s son Donald Trump Jr., who has repeatedly attacked Colonel Vindman, and Tucker Carlson, another prominent Fox host.

“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,” Mr. Pressman wrote in the letter.

Update: Fox responds in an email: “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.”