Conservative MP Jacob Rees-Mogg was caught up in a scuffle at a student event where he was due to speak.
Footage posted online appears to show the backbencher surrounded by a group of people, with shouting audible in the background.
BBC reporter James Craig, who was at the event, said university security cleared the protesters from the hall within five minutes.
Mr Rees-Mogg then delivered his speech, he said.
He had been speaking at the University’s Politics and International Relations Society.
On Twitter, eyewitness Chloe Kaye, who filmed the scuffle, described “a huge amount” of physical violence.
Others condemned the protesters.