In a letter Thursday to Acting Homeland Security Secretary Kevin McAleenan, 33 House Democrats demanded that U.S. Border Patrol Chief Carla Provost resign over her participation in a secret Facebook group in which members of the federal agency shared racist, sexist, and violent comments about migrants and members of Congress.

Early last month, ProPublica reported on a Facebook group called “I’m 10-15,” which references the Border Patrol code for “aliens in custody.” Created in August of 2016, the group had nearly 10,000 members who were currently or formerly employed by the Department of Homeland Security. Just days after the initial report, The Intercept‘s Ryan Devereaux revealed that Provost was a member of the group.

The nearly three dozen lawmakers, including Democratic Reps. Ayanna Pressley (Mass.) and Susan Wild (Penn.), charged in their letter (pdf) to McAleenan that Provost “has lost the public’s confidence that she can faithfully execute the responsibilities of her position without bias or prejudice.”

They wrote in part:

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While Provost initially publicly expressed surprise about the group, promised that employees who participated would be held accountable, and said the DHS Inspector General’s Office would be investigating the matter, the letter pointed out that “conspicuously absent from her statement was an admission that she had been a member of the Facebook group for months.”

“It is Ms. Provost’s responsibility to discipline employees who fall under her agency’s auspices, not participate in conduct unbecoming of her office,” the lawmakers declared, calling on McAleenan “to follow Ms. Provost’s own promise of accountability, by immediately seeking her resignation.”

In a tweet announcing the letter, Pressley called Provost’s participation in the group “deeply disturbing and absolutely unacceptable.” She wrote that if McAleenan “has one ounce of dignity left, he’ll demand her resignation immediately.”

The lawmakers, in the letter, also highlighted the humanitarian crisis at the U.S. Southern border—from the forcible separation of children from their parents to the inhumane conditions in which migrants have been detained. According to the letter Thursday, “the callousness displayed in the Facebook group is matched only by the callous treatment of children detainees under Ms. Provost’s watch.”