The Texas Tech University System has ordered all faculty to refrain from classroom discussions of transgender identity, The Texas Tribune reported.

In a letter to the leaders of the five universities in the system, Texas Tech Chancellor Tedd Mitchell wrote that the institutions must comply with “current state and federal law,” which “recognize only two human sexes: male and female.“ He cited Texas House Bill 229, which defines sex strictly as determined by reproductive organs, a letter from Texas governor Greg Abbott directing agencies to “reject woke gender ideologies,” and President Trump’s January executive order—which is not a federal law—declaring the existence of just two genders.

“While recognizing the First Amendment rights of employees in their personal capacity, faculty must comply with these laws in the instruction of students, within the course and scope of their employment,” Mitchell wrote.

The move follows a confusing week at Angelo State University—part of the Texas Tech System—where a new set of policies first seemed to prohibit faculty from engaging in any sort of pride displays but ultimately limited discussion and content only related to trans identity.

Mitchell’s letter provided little guidance for faculty about how to implement the new policy, suggesting it presents certain challenges.

“This is a developing area of law, and we acknowledge that questions remain and adjustments may be necessary as new guidance is issued at both the state and federal levels,” he wrote. “We fully expect discussions will be ongoing.”