WASHINGTON (AP) — The Trump administration on Thursday opened a civil rights investigation into the hiring practices at George Mason University, expanding a national campaign against diversity policies to Virginia’s largest public university.

“George Mason University (GMU) received a new Department of Education letter of investigation this morning as it was simultaneously released to news outlets, which is unprecedented in our experience. As always, we will work in good faith to give a full and prompt response.

The Department of Education has launched a probed into George Mason University's hiring practices, the second time this month that the school has been the target of a federal investigation. A complaint by professors alleges that George Mason violated the Civil Rights Act of 1964 by giving preferential treatment to candidates from "underrepresented groups.