US President-elect Donald Trump's son-in-law, Jared Kushner, will become a senior White House adviser working on trade and the Middle East, transition officials said on Monday, in a rare case of a close presidential family member taking a major job. Meanwhile, a group of six Democrats on the House of Representatives Judiciary Committee said they had written to the Justice Department and US Office of Government Ethics asking them to review concerns about nepotism and conflicts of interest arising from Kushner's appointment. Kushner, 35, who is married to Trump's daughter Ivanka, is taking the post after receiving legal counsel that doing so would not violate US anti-nepotism law, transition officials said. The position, unlike Cabinet posts, does not require US Senate confirmation, and Kushner will not be paid. Trump, in a statement on Monday announcing the choice, said Kushner was a "tremendous asset and trusted adviser throughout the campaign and transition." Kushner, who like Trump is a New York real estate developer, emerged as an important voice early in his father-in-law's presidential campaign and was involved in almost every aspect of it from personnel decisions to strategy and fundraising. Ivanka Trump, who like her husband has been a close adviser to the president-elect, will not take on a role in her father's White House but will focus on settling her family in Washington. Kushner and his wife will undertake significant divestments of their wide-ranging financial portfolios as they prepare for their move to Washington from New York and face inevitable questions about a potential conflict of interest. Senior transition officials and a lawyer for Kushner laid out the arrangement in a conference call with a small group of reporters. Kushner is to work closely with incoming White House Chief of Staff Reince Priebus and senior strategist Steve Bannon in advising the new president, and the officials said he would focus at least at first on trade policy and the Middle East. Trump, who takes office on Jan. 20, has vowed to rewrite international trade deals to make them more favorable to the United States. He has also pledged to move the US Embassy in Israel from Tel Aviv, where it has been for 68 years, to Jerusalem, all but enshrining the city as Israel's capital despite international objections. Jamie Gorelick, a New York lawyer who served as deputy attorney general for Democratic President Bill Clinton and helped advise Kushner, said his new post would not violate a 1967 anti-nepotism statute. She said Congress in 1978 authorized the president to hire personnel for the White House office "without regard" to federal personnel laws like the anti-nepotism statute and that court rulings had determined the White House was not an "agency" under the anti-nepotism law. "I'm not saying that there isn't an argument on the other side, and I respect the people who have made the argument on the other side. I just think we have the better argument," Gorelick said. Richard Briffault, a government ethics expert at Columbia Law School, disagreed, saying: "Given the fact that the president is specifically mentioned, you would think that someone that is working for the president would be covered" by the anti-nepotism law.