A British Harvard student who believes Donald Trump targeted him in his explosive speech has opened up about fears over his future.

Alfred Williamson, 20, has been studying for a double major in physics and government but his stint at the prestigious US university has come under threat after the President cut off visas for international students.

The Welsh-born student currently lives in Copenhagen and despite a Boston judge's decision to temporarily block Trump's ban, he does not rate his chances of making a swift return to the Ivy League campus.

Williamson also reckons that the President singled him out while announcing his 'dehumanising' immigration measures.

'They're taking people from areas of the world that are very radicalised and we don't want them making trouble in our country,' Trump said earlier this week while pledging to slash Harvard's overseas student intake from 31 per cent to 'around 15 per cent'.