Former UKIP chief Paul Nuttall has stop the occasion in protest on the choice to nominate Tommy Robinson as an adviser.
Mr Nuttall mentioned he was leaving as a result of the occasion was being taken in a path “dangerous to Brexit”.
The affiliation with the previous English Defence League chief would “appall many average Brexit voters,” he mentioned.
Mr Nuttall’s resignation follows that of fellow former chief Nigel Farage, who expressed related sentiments.
The previous historical past lecturer, from Bootle, Merseyside, mentioned he would proceed to work as an MEP for North West England.
He mentioned: “Placing Tommy Robinson entrance and centre, while Brexit is within the technique of being betrayed is, for my part, a catastrophic error.
“The occasion management and my MEP colleagues have been conscious of my views on this situation for a while.”
Mr Nuttall took over from Nigel Farage as chief of UKIP in November 2016.
He was later closely criticised after admitting claims that he had misplaced shut buddies within the Hillsborough catastrophe have been false.
Standing down in June 2017, he mentioned the occasion was extra related than ever and would proceed to be “the guard canine of Brexit”.
He additionally mentioned the occasion had “misplaced its approach in latest occasions” and attacked its “clumsy, blundering strategy” to tackling feminine genital mutilation and its “hardline anti-Islam messages”.
Mr Nuttall joined UKIP in 2004 after working for the Conservatives in a council election in Bootle two years earlier.
He turned an MEP for North West England in 2009 and served as UKIP deputy chief from 2010.