The White House is calling for a review of materials in the Smithsonian museums ahead of America’s 250th birthday next year.

In April, the National Museum of African American History and Culture sparked controversy after it announced it would return several artifacts to their donors, including a Bible carried during a civil rights protest and Harriet Tubman’s book of hymns, NBC News reported.

Historians and researchers are expressing “grave concern” about President Trump’s push to purge museums of information he dislikes. “Such political interference stands to impose a single and flawed view of American history onto the Smithsonian,

Smithsonian museums will be reviewed by the Trump administration ahead of America's 250th anniversary to ensure exhibits are historically accurate and showcasing exceptionalism.