The Lib Dem MP who argued about antisemitism with John McDonnell has said she felt like she had to "mansplain" Jew-hate to him during their clash on TV.

Layla Moran, the first ever MP of Palestinian origin, clashed with the shadow chancellor during an appearance on the BBC's Politics Live, when she condemned posters that had been put up all over London that said "Israel is a racist endeavour", an attack on the IHRA definition of antisemitism Labour had belatedly adopted the day before.

"The fact that this has come from a group that purportedly is speaking for Palestinians, I take great offence at myself, because I think it is blatantly antisemitic," she said, after Mr McDonnell has insisted: "It is not at all antisemitic to describe a state as racist." 

In an interview with the Evening Standard this week, Ms Moran said: "I had to mansplain antisemitism to him."

“The people who put it up were called London Palestine Action. As a Palestinian they don’t speak for me, and they are blatantly racist signs. You don’t say a whole country is racist."

She also mocked the claim that Mr McDonnell, 67, was "on a journey" regarding Israel and antisemitism.

“I was like ‘really?’ You’re 60 something years old, come on. If you haven’t realised by now that this is antisemitism no wonder there’s a problem in the Labour Party," she told the Standard.

Ms Moran, whose mother was born in Jerusalem, also told the paper she rarely intervened in the Israel/Palestine debate because it was "so emotive".

She added: "I’ve been attacked by people who say you’re not a real Palestinian and your mum’s not a real Palestinian for raising you that way.

"But when I see someone who is ‘on a journey about being antisemitic’, I’m sorry but I’m intervening.

"Calling out antisemitism doesn’t make me any less Palestinian. There’s a nuance in the argument that has been lost and Corbyn not saying antisemitism is wrong has fuelled the problem. Some responsibility does lie at his door."