WASHINGTON - Senior White House adviser Kellyanne Conway drew sharp criticism from a top Republican lawmaker and complaints on Thursday over the ethics of using her position to promote product lines of President Donald Trump's daughter Ivanka, a day after he attacked a retailer for dropping them.Federal ethics rules prohibit executive branch employees from using their positions to endorse products or for the private gain of friends. The law does not apply to the president."Go buy Ivanka's stuff ... I'm going to go get some myself today," Conway told Fox News in an interview from the White House. "I'm going to give a free commercial here: Go buy it today, everybody."Republican Jason Chaffetz, chairman of the House of Representatives Oversight committee, told The Associated Press Conway's promotion of the brand was "clearly over the line, unacceptable."Chaffetz spokeswoman M.J. Henshaw confirmed his comments.