Even though she will have an as-yet-undefined role in her father’s presidential administration and recently spoke on the phone with Michelle Obama, Ivanka Trump calls the suggestions that she’ll perform White House duties reserved for the First Lady “inappropriate.”

As Cosmopolitan points out, Ivanka claimed in an interview with Good Morning America’s Deborah Roberts that whatever her role in the Trump administration eventually entails, it’ll leave room for Melania Trump to take on the causes and the roles that the wife of the president has traditionally assumed.

“I think it’s an inappropriate observation,” Ivanka said. “There is one First Lady, and she’ll do remarkable things.”

A little over a week ago, Ivanka officially left both her eponymous business and her executive role at the Trump Organization to move with her husband, Jared Kushner, to reportedly move to Washington, D.C. Kushner will be an adviser to President-Elect Donald Trump, but Ivanka’s formal role hasn’t yet been announced.

As one of the few measured voices during her father’s campaign generally speaking on women’s rights (a subject that was something of a non-starter for the president thanks to his checkered past), she was called Trump’s “surrogate.” Melania’s decision to remain in New York in service of her son Barron’s education further fueled rumors that Ivanka’s role in the administration would more closely resemble that of a First Lady.

Roberts says that Ivanka later explained she thinks the implication is “sexist.”

The full interview airs on 20/20 at 10 P.M. E.ST. on Thursday, and includes conversation with Donald Trump Jr. as well.