The chairman of Leave.EU has written to scores of Folkestone and Hythe constituents branding their MP a “disgrace” and a “snake in the grass”.

But MP Damian Collins shot down Arron Banks’s unprecedented move as “intimidation and bully tactics”.

The clash comes after Mr Banks, a millionaire Ukip donor, this month launched a campaign to deselect ‘remoaner Tories,’ naming Damian Collins as a target.

Today, in a letter to constituents he said: “Despite representing a constituency that voted 62-38 in favour of Brexit, Mr Collins, who voted Remain, has never respected the result.

“He is a snake in the grass.”

The letter goes on to criticise Mr Collins for speaking at a left-wing festival during the summer where Guardian journalists also spoke.

It continues: “Mr Collins also chairs the parliamentary select committee on Digital, Culture, Media and Sport.

“Mr Collins used his position to launch a pathetic witch-hunt against Brexit.”

Mr Banks wrote that when he attended the inquiry he was forced to defend his reputation against “low grade MPs” and labelled politicians the “lowest form of life.”

He claims the Conservative MP would betray constituents and urges readers to join the Tory party to “apply pressure from within.”

Speaking to KentOnline this evening Mr Collins said Mr Bank's personal attack means he's "doing something right."

"Like so many would-be bullies, Banks likes to have a go at other people, but hates being questioned about his own affairs..." Damian Collins

He said: "It's bully tactics, that is his style, he believes that if he throws his weight around people are going to do what he wants - but I won't.

"In fact, I believe that if you're upsetting Arron Banks then you're certainly doing your job right."

He added a number of constituents today, on reading the letter, dubbed Mr Banks as "libellous and ridiculous."

Mr Collins said: "One constituent has contacted me saying it is, the most 'despicable piece of slander and defamation I have seen.'

"Another wrote calling his letter, a libellous and ridiculous attack on (my) character as a member of parliament."

Mr Collins added Mr Banks’s main complaint is being summoned by the select committee to give evidence into an inquiry about disinformation and fake news.

"He is angry that we asked him about his links to Russia, secret meetings with that country’s ambassador, connections to Cambridge Analytica, and where he found the funds to become the biggest donor in British political history, when so many of his businesses seem to lose money.

"Like so many would-be bullies, Banks likes to have a go at other people, but hates being questioned about his own affairs."

We have contacted Mr Banks for comment.