Corbyn ally says party is "better than this" as frontbencher retorts: "I will not take lessons from you about civility in politics."
Ex-shadow chancellor John McDonnell leads calls for Keir Starmer to withdraw suggestion prime minister does not think child sex abusers should be jailed.
The Labour Party's left wing has started speaking out in support of Jeremy Corbyn.
“This is not a moment for posturing and standing on picket lines,” the shadow foreign secretary said.
The Labour leader stopped short of endorsing 11 backbenchers who signed a Stop The War Coalition letter on Ukraine.
Sources close to Keir Starmer had said the former shadow chancellor could be kicked out of the party if he had shown up.
The former shadow chancellor is due to speak at the 'No War In Ukraine' event in London.
Leader urged to "take the gloves off" as MPs' frustration grows over his cautious approach.
Cross-party opposition includes 40 Conservatives and former Labour leader Jeremy Corbyn.
Labour leader under pressure, but can his "partnership with business" avoid the tax/spend conundrum?