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Former Labour Prime Minister Tony Blair has told Mr Macron to "hold firm" over the Brexit deal, it has been reported.

Mr Blair, who has been campaigning for a second referendum, is understood to have told the French premier that Parliament will be forced to accept a softer Brexit or even call for a second referendum if the EU fails to give ground.

According to the Daily Telegraph the former PM told Mr Macron to wait and see how events play out in London.

Peter Bone, a Eurosceptic Conservative MP, told the paper: “It is totally unacceptable for a former prime minister to go around the heads of European countries and undermine the Government’s position. I’m not sure we could find another time in modern history when this has happened.

" Tony Blair has to realise he has had his time as prime minister and I’m surprised and disappointed he has done this. I doubt he would have liked it if his predecessors had done this to him."

The Prime Minister is now being urged to postpone the Commons showdown over her deal- due tomorrow night - to avoid a repeat of January's 230-vote defeat.

A delay would be a betrayal of the Prime Minister's solemn promise to Parliament to hold the vote by March 12.

Yet it may be the only way of avoiding a crushing defeat that could lead to a Brexit delay and threats to her leadership.

If MPs vote down her deal they will then have the chance to vote on extending Article 50.

(Image: PA)

The Prime Minister has suggested a three-month extension but the EU have hinted that any delay could have to be longer.

While EU diplomats have hinted they will demand more money if Brexit is delayed.

An EU source told the Daily Telegraph: "Lines are hardening against extension... Anything more than a few weeks will come with legal and financial conditions attached."