Melania Trump may be keeping relatively quiet since her husband became the president-elect of the United States, but that doesn’t mean she’s not feeling the heat of his frequent controversies. Since Donald Trump defeated Hillary Clinton at the polls last week, the fashion industry has been forced to consider whether it wants a role in the new administration at all. Current First Lady Michelle Obama has been styled and dressed by designers since she stepped into the White House eight years ago—and has frequented the covers of magazines like Vogue and Essence—but whether Melania Trump will encounter the same treatment has become an ongoing debate due to her husband’s alienating and alarming rhetoric. On Thursday, designer Sophie Theallet, who has dressed Obama in the past, posted an open letter to her Twitter account saying she will not dress Trump and urged other designers to follow suit.

“The Sophie Theallet brand stands against all discrimination and prejudice. Our runway shows, ad campaigns, and celebrity dressing have always been a celebration of diversity and a reflection of the world we live in,” the French-born designer wrote, adding, “As one who celebrates and strives for diversity, individual freedom, and respect for all lifestyles. I will not participate in dressing or associate myself in any way with the next First Lady. The rhetoric of racism, sexism, and xenophobia unleashed by her husband’s presidential campaign are incompatible with the shared values we live by.”

Theallet notes that she herself is an immigrant who has been able to pursue her dreams in the United States. Donald Trump ran on a platform of extreme immigration reform that has stirred fears and apprehension of deportation, especially after he has doubled down on his campaign remarks after winning the election.

Though Melania Trump, a former model and immigrant herself, has worn designer clothing throughout the campaign, including the now-infamous $1,100 Gucci pussy-bow blouse, she appears to have obtained it herself. After the Republican National Convention in July, Trump’s spokesperson told Women’s Wear Daily that she ”isn’t working with any designers,” and had purchased her convention dress online. There has been a noticeable absence of press releases from brands encouraging the media to note that she is, in fact, wearing their clothing—usually the sort of thing fashion brands are very happy to call to attention.

When reached, a spokesperson for Theallet said the designer has no additional comment. Vanity Fair has reached out to Trump for comment.