A medical advocacy group sued U.S. health agencies over the removal of websites containing public health data in response to an executive order by President Donald Trump targeting what his administration deemed "gender ideology extremism."

Doctors for America said in a lawsuit filed in Washington, D.C., federal court that the U.S. Centers for Disease Control and Prevention has taken down multiple longstanding webpages since the order.

Removed content includes a CDC page on behavioral health risks among youth, which the lawsuit states is used to assess health concerns such as bullying and vaping; pages with data on HIV prevalence and associated risk factors; and a webpage on HIV testing, described in the lawsuit as a resource for physicians.

The lawsuit also states that the FDA removed webpages recommending the inclusion of women and underrepresented groups in clinical trials.

"The removal of this information deprives researchers of access to information that is necessary for treating patients, for developing clinical studies that produce results that accurately reflect the effects treatments will have in clinical practice, and for developing practices and policies that protect the health of vulnerable populations and the country as a whole," the lawsuit said.

Trump, a Republican, signed an executive order on his first day back in office stating that the United States will recognize two sexes, male and female. On Jan. 29, the U.S. Office of Personnel Management issued a memorandum instructing agencies to take down public-facing materials promoting what it referred to as "gender ideology."

The lawsuit names the CDC, FDA, and their parent agency, the Department of Health and Human Services, as defendants. It asks the court to rule that OPM's memorandum exceeded the agency's authority and to reinstate the removed webpages.

HHS and the CDC declined to comment. The FDA and OPM did not immediately respond to requests for comment.

Doctors for America was founded in 2008 by Vivek Murthy, former U.S. Surgeon General under Presidents Barack Obama and Joe Biden; Mandy Cohen, former CDC director under Biden; and Alice Chen, a professor at the University of California, Los Angeles' medical school.