Mr Lansman, the Jewish founder of left-wing campaign group Momentum, criticised the story on Sunday, arguing that police had reviewed “new material… that Labour didn’t have” before arresting Ms Sheerin.
He tweeted: “The decision to charge Patricia Sheerin was based on different, more serious, material, to what Labour and [the Leader of the Opposition] reviewed.
“So the basis of this article - to criticise Labour / LOTO for not immediately suspending someone who was later charged by the police - is erroneous. They were reviewing different material and therefore cannot be compared. The original material wasn’t nearly as serious.
“Laura Murray’s done more than anyone I know (including the disgruntled ex-staffer who’s leaking these emails) to tackle antisemitism in the party.”
Mr Lansman also argued that Ms Murray was under greater scrutiny than Brandon Lewis, the chairman of the Conservative Party, in a reference to allegations of Islamophobia in the party.
