Mr Watson has written to Labour’s general secretary Jennie Formby outlining his concerns about behaviour in the constituency. Ms Berger is an outspoken critic of her party leader Jeremy Corbyn and was facing two no confidence motions before they were withdrawn earlier today. A source in Mr Corbyn’s office said it was “the right decision” to withdraw the motions.
Ms Berger has criticised Mr Corbyn’s handling of the anti-Semitism row engulfing the Labour party as well as his handling of Brexit.
Shadow chancellor John McDonnell had suggested the no confidence motions were because the Labour party feared Ms Berger was planning to join a breakaway party rather than because of her criticism of Mr Corbyn.
Mr McDonnell told Sky News: “My advice really, on all of this, is for Luciana to just put this issue to bed.
“Say very clearly ‘no, I’m not supporting another party, I’m not jumping ship’.”
However Mr Watson said: “Let us not forget our honourable colleagues on both sides of this House, the subject of death threats, the subject of racist abuse, the subject of misogynistic abuse, the subject of bullying and anti-Semitism.
“As deputy leader of my party let me say to the honourable colleagues facing that abuse and in particular my friend and comrade the member of Liverpool Wavertree (Ms Berger) that she has our solidarity and she has our support as she battles the bullying hatred from members of her own local party.
“They bring disgrace to the party that I love.”
Other senior Labour MPs also rallied to Ms Berger’s side.
Chuka Umunna said Ms Berger deserved more respect.
He tweeted: “So a victim of outrageous racism in @UKLabour must promise she will not walk because of that racism and then this can all go away.
“How about demanding her CLP treats her with the respect she deserves. How about the party deals with that racism. Words fail me. Totally unacceptable.”
Meanwhile shadow education secretary Angela Rayner added: “I don’t know what’s happening in Luciana’s constituency but she has my full support in speaking out and stamping out the racism and antisemitism that’s in our party & wider community.”