Humiliated Theresa May was left speechless at PMQs today after even Boris Johnson laughed at Jeremy Corbyn's jibe over Brexit .
The stony-faced Prime Minister stood in virtual silence for 20 seconds while her Foreign Secretary chuckled during a vintage edition of the weekly clash.
Labour's leader mocked the PM over a leaked recording of Boris mocking her Brexit plan and saying there would be a "meltdown".
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The Foreign Secretary also called for Donald Trump to be put in charge of Brexit talks because "actually you might get somewhere".
Mr Corbyn asked Mrs May mockingly: "Did she do as the Foreign Secretary suggested and ask him to take over the Brexit negotiations?"
The Tory leader stood up to reply - but no reply came. As Boris tittered, Labour MPs seized the brief delay to unleash a chorus of jeers.
Ashen-faced, she glared, smoothed over her papers and stared upwards as she tried to start her sentence until Speaker John Bercow called order.
When she regained her composure she accused Labour of being the party that is divided - and accused Mr Corbyn of not understanding her plans himself.
She explained her backup plan for customs - which could extend EU rules to 2022 (see below) - saying: "Let me be very clear about what the backstop is."
But Mr Corbyn, speaking at Prime Minister's Questions, remarked: "I'm not really sure if it’s a backstop or a backslide she’s talking about here."
And Labour MPs jeered the words of the EU's chief Brexit negotiator: "Backstop means backstop!"
It comes amid a Tory row after Mrs May avoided defeat in a key vote last night on her EU Withdrawal Bill.
She managed to persuade Tory rebels not to ask for a "meaningful vote" - which could've stopped a no-deal Brexit - by offering a compromise.
But Tory Remainers and Brexiteers were in a furious dispute this morning about exactly what that compromise meant, and whether it could give Brussels negotiators the upper hand.
Speaking at Prime Minister's Questions, Mr Corbyn said Hard Brexit-backing Boris Johnson "inhabited a parallel universe" and questioned when the PM would publish a long-awaited White Paper with the next steps of her plan.
He called on her to "delay" a long-awaited EU summit this month "while the government decides what its position actually is".
But Mrs May said there was never due to be a Brexit deal at the summit - and hinted the White Paper will be published in July.
She said only the Tories would deliver on the 52% vote of the British people to leave the EU - and Labour were trying to "frustrate Brexit".
Jabbing her finger at Labour, she added: "If he wants to talk about differences of opinion I’ll tell him what division really is.