President Donald Trump has signed an executive order on the Smithsonian Institution that targets funding to programs that contain what he calls “divisive narratives” and “improper ideology.”

The order is vague but suggests Trump is seeking to purge elements of what conservatives view as a revisionist history of the US that places systemic racism at the heart of its narrative.

Trump’s order casts a long shadow over the Smithsonian, which, while not a federal agency, is a trust instrumentality of the U.S. government and operates under the guidance of a Board of Regents