Kellyanne Conway is seen as White House Press Secretary Sean Spicer speaks at a press briefing at the White House.

An independent government ethics office has urged the White House to probe and potentially discipline President Donald Trump's advisor Kellyanne Conway for comments she made supporting Ivanka Trump's clothing line.

In a letter released Tuesday, Office of Government Ethics Director Walter Shaub told deputy White House counsel Stefan Passantino that Conway appeared to breach a rule preventing her from using her position to promote private products. On Thursday, Conway said on Fox News to "go buy" the president's daughter's Nordstrom line, later adding that she would "give it a free commercial."