Several of the nation’s top colleges have been threatened to be sued by an anti-affirmative action group over a decline in enrollments among Asian American students.

According to the New York Times, the Students for Fair Admissions, the group behind the lawsuit against Harvard that ended affirmative action across the U.S., has threatened to sue Princeton, Yale, and Duke for their alleged non-compliance with the Supreme Court’s ruling.

Student for Fair Admissions President Edward Blum sent letters to the schools last week, noting the drop in enrollment of Asian American students.

“Based on S.F.F.A.’s extensive experience, your racial numbers are not possible under true neutrality,” the letter reads, per the Times. “You are now on notice. Preserve all potentially relevant documents and communications.”

According to reports, Duke and Yale saw a 6 percent drop-off among Asian American students from last year. Princeton’s Asian American student population fell from 26 percent to 23.8 percent. Black student enrollment remained mostly the same at the three schools.

Experts believe it may be too early to know if current statistics are indicative of a larger trend following the affirmative action ban.

“It’s disappointing to see the same old intimidation tactics that Blum is using here to scare universities away from doing what they can to ensure that high-quality, talented students are given a shot,” OiYan Poon, a researcher of college admissions systems, said.

Following the Supreme Court’s ruling, college admission offices aren’t able to view parts of the application where students identify their race or ethnicity until after they are enrolled. However, students can share experiences tied to their racial identity in their admission essays.

“I think the fight is now going to move away from policies to what is happening in admissions offices,” Cornell law professor William Jacobson said.

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