Ivanka Trump facing lawsuit over Kellyanne Conway endorsement

White House advisor Kellyanne Conway was counselled after a possibly illegal endorsement of Ivanka Trump's clothing line last month - but now she may have landed herself in even more hot water after competitors claimed her plug gave Ms Trump's brand an unfair advantage.

Department store Nordstrom controversially dropped Ms Trump's brand following calls from anti-Donald Trump protesters to boycott the label - but it denied the move was political, saying it was purely down to poor brand performance.

Ms Conway was interviewed on Fox News just two days after that occurred, and when asked about the recent development, she took the opportunity to give a glowing endorsement of her employer's daughter's line.

"Go buy Ivanka's stuff, is what I would tell you," she said. "It's a wonderful line. I own some of it. I fully - I'm going to just, I'm going to give a free commercial here: Go buy it today, everybody. You can find it online."

However the plug was immediately slammed, with some claiming it was in violation of a law that prohibits those in public office using their position "for the endorsement of any product, service or enterprise, or for the private gain of friends, relatives, or persons with whom the employee is affiliated".

While the threat of any personal legal consequences seem to have passed, Ms Conway may have inadvertently landed Ivanka Trump's clothing company in court as a result of her comments.

TMZ reports that competitor Modern Appealing Clothing has filed a lawsuit that claims Ivanka Trump's clothing line is benefitting too much from her position as First Daughter.

The company also claims that Ms Conway's comments were just one example of many where the Trump administration was "exploiting the power and prestige of the White House" to help boost sales.

They appear to have a case; fashion search engine Lyst revealed recently that Ivanka's sales between January and February went up 346 percent on the previous month, with the brand's chief executive saying they were "some of the best performing weeks in the history of the brand".

Modern Appealing Clothing's lawsuit has demanded that Ivanka Trump's brand immediately stop using her political position as a vehicle to increase profits.