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The American Civil Liberties Union on Wednesday asked a federal judge to pause the removal of books from Pentagon-run schools that pertain to diversity, gender identity and race as the issue makes its way through the courts.

The ACLU in April sued on behalf of 12 students, including two in Virginia, who attend schools run by the Defense Department.

The lawsuit argues that executive orders by President Donald Trump calling for the removal of government materials dealing with such topics as diversity, gender identity or race violate the students' First Amendment rights.

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Matt Callahan, senior supervising attorney with the ACLU of Virginia, said the Constitution prohibits what is called "viewpoint discrimination," adding that means the government picks and promotes a belief or ideology, and silences opposing viewpoints.

"Students have a First Amendment right to receive information, and when the government reaches into schools it runs and removes books or curriculum from those schools, solely because of the viewpoint expressed in those materials, it violates the students rights," he explained. "And that's what the Department of Defense Education Activity has done here in response to Trump's executive orders."

Defense Secretary Pete Hegseth is named in the lawsuit. He said in a memo that diversity and inclusion efforts are incompatible with Defense Department values.

A number of titles have been taken off shelves, including such classics as Harper Lee's "To Kill a Mockingbird" and Ray Bradbury's "Fahrenheit 451." Books are not the only focus of alleged Pentagon censorship in its schools. Portions of the Advanced Placement Psychology curriculum have also been removed.

Callahan said schools and libraries can remove materials or change curriculum for educational purposes. But he explains that's not the reason the government removed those titles.

"People all the time have to turn over the contents of libraries because books get outdated, new books are written. The violation here is because of the reason these books and curriculum are being removed," Callahan continued. "The government has made explicitly clear that the reason it's removing these books and this curriculum is that they don't like the ideology contained therein."

The Defense Department educates more than 60,000 students of service members in 161 schools worldwide, including in Virginia.