Welsh student at Harvard fears Trump ban will stop him finishing his degree

Alfred Williamson's future in doubt after US president's attempt to stop foreign nationals studying at the university

A British freshman at Harvard fears he will not be able to return to the US to complete his degree after Donald Trump demanded the university stops teaching international students.

Alfred Williamson, 20, from Cardiff, left Boston when the academic year ended two weeks ago to visit family in Denmark, only to wake up on 23 May to dozens of missed calls and messages from loved ones about the decision to prevent the Ivy League university from enrolling or retaining foreign nationals.