A video from 2013 has surfaced of the U.K.’s Jeremy Corbyn accusing British Zionists of having no understanding of British culture.

“Zionists … clearly have two problems. One is they don’t want to study history, and secondly, having lived in this country for a very long time, probably all their lives, they don’t understand English irony either. They needed two lessons, which we could perhaps help them with,” said Corbyn, who serves as Opposition and Labour Party leader.

The Labour leader made the comments at a conference promoted by the Palestinian terror group Hamas and featured “a range of anti-Semites, homophobes and conspiracy theorists,” according to the Daily Mail. “Several were connected to Hamas. One called for attacks on the Royal Navy in the past, and led a boycott of Holocaust Memorial Day.”

Jonathan Sacerdoti, who was a founding trustee of the Campaign Against Anti-Semitism, told the Daily Mail that “the idea that British Jews somehow haven’t absorbed British values is outrageous.”

“To doubt our Britishness because we disagree with your controversial views on Palestine, when you are the one fraternising with extremists, is deeply anti-Semitic. British Jews are right to be scared,” he said.

Labour Friends of Israel has demanded that Corbyn apologize for attending the conference, which was organized by the Palestine Return Centre—a group that has close links to both Hamas and Corbyn.

“The thousands of Israelis who have family members killed by Hamas terrorism will not understand why Mr. Corbyn believes these are suitable people to associate with,” said the group.

The comments revealed regarding Zionism is just the latest in a wave of scandal and controversy facing Corbyn in recent weeks over his views on Israel, anti-Semitism and ties with Palestinian terror leaders. It was revealed last week that Corbyn attended a memorial ceremony honoring the Palestinian terrorists behind the 1972 Munich Summer Olympics massacre that killed 11 Israeli coaches and athletes.