Mr Rees-Mogg was leaving a public speaking engagement at the Friends’ Meeting House in Euston, London, when his car was surrounded by a handful of protesters. One man verbally assaulted the Conservative MP for North East Somerset shouting through a megaphone: “In you go Jacob, you horrible little man. Take your fascism with you.”
Another man then approached the MP’s car, a black Mercedes, and threw water from a plastic bottle at Mr Rees-Mogg’s direction.
Shocking footage recording the assault suggest the thug was targeting Mr Rees-Mogg’s head but failed to hit it and only soaked his trousers.
Yet, the man holding the megaphone shouted once again, saying: “Have a drink of water. It’s European water.”
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Mr Rees-Mogg didn’t react to the abuse but continued smiling as his car was driven away.
He later commented the aggression with a light joke, telling the MailOnline: “It is not easy to turn me into a Tory wet.”
The jest referred to the label “wets” created by Margaret Thatcher in 1979 to address her opponents within the party.
This is the latest attack perpetrated against a hard-line Brexiteer in the past weeks.
During the European elections campaign, Ukip political advisor and anti-Islam activist Tommy Robinson, Ukip candidate Carl Benjamin and Brexit Party leader Nigel Farage have been doused with milkshakes as part of a growing protest against figures on the far-right and hard-Brexit supporters.
Paul Crowther, the 32-year-old man who threw a milkshake at Mr Farage outside a Waterstones bookshop in Newcastle city centre, was handcuffed at the scene and dragged away.
He explained his action saying: “It’s a right of protest against people like him.”
Speaking to reporters, he added it was a banana and salted caramel milkshake bought from Five Guys.
He continued: “I was quite looking forward to it, but I think it went on a better purpose.”
Mr Farage’s response to the milkshake attack was harsher than Mr Rees-Mogg, as he said “some Remainers” became “radicalised” over the past years.
He wrote on Twitter: “Sadly some Remainers have become radicalised, to the extent that normal campaigning is becoming impossible.
“For a civilised democracy to work you need the losers consent, politicians not accepting the referendum result have led us to this.”