Lord Daniel Finkelstein has admitted he cried "tears of despair" when he heard Labour splitter Luciana Berger recount her experiences of antisemitism in the Labour Party.
In a speech, Ms Berger accused the party of being "institutionally antisemitic", and said that she was leaving behind a "culture of bullying, bigotry and intimidation".
"When I saw Luciana Berger my tears did come, although admittedly I do cry quite easily," Lord Finkelstein said.
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"My tears were of despair about how bad the situation has got on antisemitism in the left, and in the populist right across Europe."
The Conservative peer appeared on the breakfast show in the wake of three Conservative MPs resigning to join the new Independent Group, alongside Berger and seven other ex-Labour MPs.
"There are lots of interesting and sophisticated political points we can make about the defections from both parties, but with the Labour Party, my reaction was I really want my Jewish friends who are Labour supporters to vote Labour," he said.
"It's very upsetting to think that they feel that they can't."