A photo of him there was tweeted by the Sefton branch of Momentum. The tweet was later deleted.
In his speech, Mr McCluskey said: “We’re being told that we’re bullies in this city, that we’re antisemitic.
“The very city that when the real antisemities turn up to walk and march on our streets …we kick them out...
“How proud I am that this city has always been a city that has rejected racism and antisemitism. I predicted some time ago you would hear the words bullying, intimidation, intolerance bandied about by right-wing Labour MPs.
“I’ve got another word for it - accountability.”
Referromg to Jewish Liverpool MPs such as Dame Louise Ellman and Luciana Berger, who dramatically quit the party last month, Mr McCluskey added: “We have the right to question them if we’re not sure that they’re speaking with the views we hold.”
Speaking about the event, Mr Carden added: "Liverpool has come under attack in the last week and it's important that we speak up for Liverpool when it comes under attack and speak up for party members and party democracy in our political parties.
"Liverpool is totally united behind Jeremy Corbyn's Labour Party and Jeremy Corbyn's leadership and it's important that we express that every so often and we celebrate it."
Mr Hatton’s presence at the event has sparked anger among many Labour MPs, annoyed by the decision to allow him back into the party.
