President Donald Trump on Friday signed an executive order halting federal funds for schools that require students to be vaccinated against coronavirus before they can attend classes in person.

Trump’s administration has already taken steps to end coronavirus vaccine requirements at the federal level, including for green card applicants, and reinstated service members who were discharged for refusing the vaccine.

The order states that “[s]ome school districts and universities continue to coerce children and young adults into taking the COVID-19 vaccine by conditioning their education on it” and warns that others could re-implement such mandates.