President Donald Trump is ordering U.S. schools to stop teaching what he views as “critical race theory” and other material dealing with race and sexuality or risk losing their federal money.

President Donald Trump is expected to sign an executive order Wednesday that could revoke federal funding for K-12 schools that teach “radical gender ideology and critical race theory,” according to multiple reports—a directive that could slash funding for tens of thousands of school districts across the country.

The measures seek to fulfill some of the Republican president's core campaign promises around education, though it's unclear how much power he has to enact the proposals.