When asked if Henry Bolton will be the next to leave, Arnott said: "He finds himself in a very hard position to be honest, I think he genuinely does believe that if he does resign the party can't survive the stresses and strains of another leadership election...but at the same time the national executive committee has just voted for a motion of no confidence in him so it's very hard for him to continue under those circumstances".
The motive of pressure on Bolton has been sentimental relationship that it maintains since this Christmas with Jo Marney, a young activist of party of 25 years, which was embroiled in a scandal when it published racist messages which it sent in social networks on Meghan Markle.
Following this, a series of senior UKIP figures, along with the deputy leader and assistant deputy leader, have quit their roles and called on Bolton to resign.
Calling for "cohesion" in Ukip and rather than focusing on the leadership debate, Mr Bolton urged the Party to "concentrate on such matters as the local government election campaign and the necessity of mobilising our efforts to ensure the government delivers true independence in all areas of government and administration when we leave the European Union".
"It has not only lost the confidence of me as the Party leader in its ability to act objectively as the Party's governing body, it has also lost the confidence of a large proportion of the membership".
And with the departure of Nigel Farage and victory in the referendum, Ukip's raison d'être - and the glue that bound the party together - was gone.
So far 12 out of 25 shadow Ukip frontbenchers have resigned over the matter, including deputy leader Margot Parker, but clearly this has still not forced him from the position.
United Kingdom politician Henry Bolton splits with model girlfriend, Jo Marney, after "indefensible" Meghan Markle remarks.
Following the NEC's action on Sunday, party members will now be balloted on whether to endorse the no confidence vote within the next month, unless Mr Bolton resigns. "It is time to 'Drain the Swamp, '" Bolton said.
Bolton distanced himself from Marney's comments and claimed to have ended their relationship.
'He should now resign from Ukip immediately so we can get on with rebuilding the party without further distraction.
"The NEC requires significant and urgent reform", he said.
The departure of charismatic leader plunged party into a freaky succession of internal fights that, on one occasion, came to hands, with a candidate hospitalized after being knocked down in European Parliament's quarters for a punch by a fellow of rows.
Ms Marney has defended Mr Bolton by referring to the private life of former Ukip leader Nigel Farage.
"To that end, again during the coming weeks, I shall be proposing a new Party constitution, with a newly constituted and reformed NEC. This puts the party in a limbo situation".
"In a single phrase, it is time to "drain the swamp".
Yesterday NEC member Piers Wauchope, a former Tunbridge Wells councillor who was the party's election candidate in North Thanet in 2015, said too much damage had been done.
UKIP is also struggling financially.