Rep. Ted Lieu Ted W. LieuThe spin on Woodward's tapes reveals the hypocrisy of Democrats Larry Kudlow defends response to coronavirus: Trump 'led wisely' Lieu on Trump 'playing it down' on coronavirus: 'This is reckless homicide' MORE (D-Calif.) says Kellyanne Conway Kellyanne Elizabeth ConwayGeorge Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' Juan Williams: Swamp creature at the White House Oversight Democrats press for probe into possible Hatch Act violations MORE broke the law by promoting Ivanka Trump Ivana (Ivanka) Marie TrumpIvana Trump: Ivanka could 'definitely' be first female president The Hill's 12:30 Report - Presented by Facebook - Trump's West Coast campaign swing Ivanka Trump to campaign for father in four states this week MORE’s clothing line in an interview on Fox News.

Conway, who is President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s counselor, urged viewers on Thursday’s broadcast of “Fox & Friends” to “go buy Ivanka’s stuff” while speaking from the White House briefing room.

“Ms. Conway’s endorsement of any privately owned business – let alone a company owned by an immediate family member of her employer, the President of the United States – is a clear violation of federal ethics law,” Lieu wrote Thursday in a letter to Walter Schaub Jr., the director of the Office of Government Ethics (OGE). "The regulations in this area are quite clear. Ms. Conway’s comments are a clear violation of the letter and spirit of the law.”

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Lieu said the office must “immediately notify the White House of the violation of government ethics law in order to prompt corrective action” for Conway.

The Democrat cited a portion of federal ethics law that reads “an employee shall not use his public office for his own private gain [or] for the endorsement of any product, service or enterprise, or for the private gain of friends, relatives.”

“Addressing this early and egregious violation is critical to ensuring the Administration’s future adherence to law,” Lieu said.

Conway called her comments “a free commercial” for the first daughter's line of clothing and accessories.

The Trump adviser was speaking to the media after the president on Wednesday hammered Nordstrom for dropping his daughter’s clothing line.

“My daughter Ivanka has been treated so unfairly by @Nordstrom,” he tweeted. "She is a great person – always pushing me to do the right thing! Terrible!”

Nordstrom later that day defended its decision, arguing its judgment stemmed from the “performance” of Ivanka Trump’s brand.

White House press secretary Sean Spicer on Thursday said Conway had been “counseled” over her comments.

But critics seized on the controversy, saying it highlighted questions about conflicts of interest in the Trump administration.