A former top official under President Obama is accusing White House adviser Kellyanne Conway of breaking the law by telling people to buy Ivanka Trump's clothing line in a TV interview.

Chris Lu, former deputy secretary of Labor, on Thursday tweeted a screenshot of the federal ethics law he believes Conway was breaking.

"This is the federal ethics law that @KellyannePolls just violated," Lu tweeted, tagging the U.S. Office of Government Ethics and Rep. Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah), the chairman of the Oversight and Government Reform Committee.

This is the federal ethics law that @KellyannePolls just violated

cc: @OfficeGovEthics @jasoninthehouse pic.twitter.com/EivJeFd7wY — Chris Lu (@ChrisLu44) February 9, 2017 ADVERTISEMENT Lu highlighted a portion which says: "An employee shall not use his public office for his own private gain, for the endorsement of any product, service or enterprise, or for the private gain of friends, relatives." Lu highlighted a portion which says: "An employee shall not use his public office for his own private gain, for the endorsement of any product, service or enterprise, or for the private gain of friends, relatives."

The law applies to employees of an "agency," which is defined as "an Executive department, a Government corporation, and an independent establishment."

During an appearance Thursday on "Fox & Friends," Conway promoted Trump's line of clothing and accessories.