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Boris Johnson has called on Theresa May to rip up her Brexit proposals while providing his own alternative plan.

The former Foreign Secretary described the Prime Minister's Chequers plan as "a moral and intellectual humiliation for this country" that will "cheat the electorate" if implemented.

Writing in the Daily Telegraph, Johnson said: "This is the moment to change the course of the negotiations and do justice to the ambitions and potential of Brexit.

"There has been a collective failure of government, and a collapse of will by the British establishment, to deliver on the mandate of the people."

In a 4,500-word column titled "A better plan for Brexit," Johnson also set out a different vision which he says would make Britain "rich, strong and free".

As a priority, the former London mayor urged the Government to ditch Chequers and negotiate a Canada-style free deal which would "fulfil the instruction of the people".

(Image: REUTERS)

He said: "Overall, the Chequers proposals represent the intellectual error of believing that we can be half-in, half-out: that it is somehow safer and easier for large parts of our national life to remain governed by the EU even though we are no longer in the EU."

Johnson also argues for a new withdrawal agreement which states that the Irish border question will be settled as part of the deal on the future economic arrangements.

He piled the pressure on the PM as she prepares to face her divided party at its annual conference in two days time.

This came as Jacob Rees-Mogg wrote in the Daily Mail that under David Cameron and Theresa May, Tories have not been willing to abandon ‘the metropolitan, Blairite approach’ to social policy.

He is expected to accuse the PM of failing to support traditional families at the party conference.