The proclamation prohibited foreign nationals from entering the US to study at Harvard or participate in exchange visitor programmes for a preliminary period of six months, and directed Secretary of State Marco Rubio to consider whether to revoke visas of international students already enrolled at Harvard.

The public policy school is the first at Harvard to go public with plans if the Trump administration is successful in banning Harvard from hosting foreign students.

President Trump has moved on several fronts to block Harvard University's enrollment of international students as his administration presses its demands for a series of policy and governance changes at the Ivy League school.