Ivanka Trump is to get her own office in the White House even though she has no official job title.
The first daughter, 35, will also get access to classified information and a government-issued phone in her unofficial capacity as an adviser to her father. However she will not be paid a salary.
Her attorney Jamie Gorelick said she would serve as the president’s “eyes and ears” while providing broad-ranging advice.
Ms Trump will be joining her husband, Jared Kushner, who is a chief adviser to President Trump and is a regular presence at his father-in-law’s side.
“I will continue to offer my father my candid advice and counsel, as I have for my entire life,” she said. “While there is no modern precedent for an adult child of the president, I will voluntarily follow all of the ethics rules placed on government employees.”
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Ms Trump has met several world leaders at the White House in recent weeks including Japanese premier Shinzo Abe, Canadian president Justin Trudeau and German Chancellor Angela Merkel.