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Sources in the cabinet are said to have confirmed May will announce her resignation this evening.

It comes after the Prime Minister received a barrage of criticism over her handling of Brexit, including her making a last-ditch plea to the Commons to vote her deal through.

But MPs were in no negotiating mood, with senior Labour and Conservative ministers slamming her proposal, saying she had no chance of getting them to back her.

According to Whitehall sources, Andrea Leadsom is set to launch a leadership bid, with unconfirmed reports from Sky saying David Lidington will take over as acting PM.

MP Tom Tugendhat has told Sky News that he has no intention of standing in a leadership race but will endorse Michael Gove.

If the embattled PM does go in hours, it will seemingly be a case of her walking before she was shoved.

There was mounting speculation MP Nigel Evans was leading a push to remove her from office, with a meeting of backbenchers set for later to plan a full-on coup.

MPs have been set to vote at the Conservatives' ruling 1922 Committee to change the leadership rules – which opens to door for May to be forced out.

May has been protected by a one vote of no-confidence per year rule after she won a vote in her leadership a matter of months ago.

(Image: GETTY)

(Image: GETTY)

According to Sky News' chief political correspondent, Jon Craig, a senior MP has said Cabinet Ministers are determined Brexiteer and former foreign secretary Boris Johnson won't replace her as PM.

They are reportedly plotting to have just two Tories on the ballot – a man and a woman.

A meeting between the Prime Minister and cabinet ministers had also apparently been scheduled tonight, but word has come out that Downing Street has cancelled it.

It is said this is so May can make a speech stepping down instead.

But Whitehall insiders are also saying that despite being told by top Tories she that she has to go, May has apparently been stubbornly digging her heels in.

The chief whip reportedly told the 1922 committee this evening that the PM is "going nowhere" and will even be campaigning tomorrow.

(Image: GETTY) (Image: GETTY)

The PM has found herself even more isolated recently as she desperately tries to salvage her deal on getting the UK out of the European Union.

Despite inviting Jeremy Corbyn to sit down and come to an arrangement on a deal with her, the Labour leader has walked away from talks after saying what she is offering is no different than before.

She then said she would bring her hugely-unpopular Withdrawal Agreement Bill (WAB) back before the House of Commons in June.

Except for this time she said there is the possibility of a second Brexit referendum in a bid to get Labour to vote for her deal.

However, Tories were left fuming at the thought of another UK vote, with senior ministers openly undermining her and saying they were working their hardest to get her out.