Liberal Democrat MP Tom Brake mocked Boris Johnson in his party conference speech over his sex life.
The personal attack came as Mr Brake pleaded for Brexit to be stopped and claimed the UK would save £3billion if they remained in the EU.
The party’s Brexit spokesman, who was mistakenly introduced on stage as the “spokesperson for exiting the MP”, said the former Foreign Secretary is “a man of many words, but no Brexit plan.
“All mouth and no trousers.”
He added: “For Boris, there has always only been one agenda – the one that puts the blonde bombshell, with the so-carefully manicured tousled hair – into No 10.
“Nothing is to get in the way of that preening ambition.
“Truth, principle, loyalty, friendship, all are expendable, as long as he secures the keys to that famous shiny black door.”
Boris Johnson has recently been accused of having an affair with PR professional Carrie Symonds after he announced he and his wife were divorcing last week.
The affair has not been confirmed but Mr Johnson has previously been caught out for being a love rat.
The former Foreign Secretary has been thrown out by his wife Marina Wheeler twice before – the first in 2004 over his affair with writer Petronella Wyatt, and then again in 2010 after he fathered a child with art consultant Helen Macintyre.
The MP for Carshalton and Wallington in London also mocked the former Brexit Secretary David Davis, calling him “inaction man” for failing to secure a deal with the EU over Brexit before he resigned in July.
The Lib Dems are currently campaigning for a second referendum which could overturn the result from the Brexit referendum in 2016.
Mr Brake claimed his party had made the prospect of another referendum more likely than ever.
He said: “We have done the heavy lifting in this campaign.
“We have taken the flak for a policy which was on the fringes two years ago, and now, is mainstream.”
The MP also added how cash earmarked for exit preparations could be used to regenerate towns and cities.
He said: “My vision of a better Britain is one that will be delivered by using the real Brexit dividend, the financial dividend liberated by cancelling Brexit, freeing up cash to boost skills, training, education, infrastructure, housing, productivity.
“If we secure a final say on the deal, and if the country backs remaining in the EU, we must pledge to use every penny of taxpayers’ hard-earned money, such as the £3 billion earmarked for Brexit, to regenerate the towns, cities and communities in the greatest need.
“The money the Government are going to squander on more customs and border officers, building unnecessary infrastructure, duplicating badly the work of European agencies, will instead be used productively investing from Blackpool to Belfast East, Birkenhead to Boston, Banff and Buchan to Bridgend.”
Mr Brake added: “Time is running out for Tory ministers who discretely share their concerns with fellow remainers in other parties, whilst publicly endorsing the Government line.
“You have to break cover too, abandon the ministerial limo, hand back your red box.
“Put the country’s interests first, as you did two years ago in the EU referendum campaign.”
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