Jeremy Corbyn attended an event run by Holocaust denier Paul Eisen’s charity in 2013, despite his claim not to have had any contact with the group in recent years.
The Labour leadership frontrunner attended a Deir Yassin Remembered commemoration in St John’s Wood Church, north west London, in April 2013.
The group was founded by Mr Eisen.
In an interview on Channel 4 News on Monday, Mr Corbyn said he had met Eisen 15 years ago, before it was publicly known that the activist was a Shoah denier.