MercoPress. South Atlantic News Agency

Controversy in UK over a second Brexit referendum, proposed by ex PMs Tony Blair and John Major

Blair said that while he admired Mrs. May's determination to get her deal through, with so many MPs opposed, it was “literally no point in carrying on digging.”

Holding another referendum on the EU would “break faith with the British people”, Theresa May will warn MPs. Former PMs John Major and Tony Blair are among those urging a new referendum if MPs cannot agree on a way forward. But the prime minister will argue that it would do “irreparable damage to the integrity our politics” and would “likely leave us no further forward”.

Last week she called off a Commons vote on her Brexit deal, admitting it was likely to be heavily rejected.

Mr Blair said last week that while he admired Mrs. May's determination to get her deal through, with so many MPs opposed to it there was “literally no point in carrying on digging.”

He said after 30 months of negotiations and with the government in “a mess ”giving the final say to the people would become the “logical” outcome if every other option were to be exhausted.

But Mrs May will tell MPs on Monday: “Let us not break faith with the British people by trying to stage another referendum.

”Another vote which would do irreparable damage to the integrity of our politics, because it would say to millions who trusted in democracy, that our democracy does not deliver.

“Another vote which would likely leave us no further forward than the last.

”And another vote which would further divide our country at the very moment we should be working to unite it.“

On Sunday she said Mr. Blair backing for another referendum was ”an insult to the office he once held“ and risked undermining Brexit negotiations.

Meanwhile, writing in the his Daily Telegraph column, former Foreign Secretary Boris Johnson said a second referendum would ”provoke instant, deep and ineradicable feelings of betrayal“. The Brexiteer said the idea a fresh poll would be held was ”sickening“.

The prime minister is due to update MPs on last week's European Council summit, where she made an appeal to EU leaders to help get the deal ”over the line.“

She went to Brussels at the end of a week in which she delayed the Commons vote on her Brexit deal, having been warned it would be rejected by a significant margin, and then went on to survive a vote of no confidence in her leadership by Conservative MPs by 200 votes to 117.

She had been seeking legal assurances over the controversial ”backstop“ plan to prevent a hard border between Northern Ireland and the Irish Republic, if no trade deal is reached. But EU leaders told her the negotiated withdrawal agreement was ”an open renegotiation“, although some clarification was possible.

Mrs May said on Friday that her talks with EU leaders had shown that ”further clarification and discussion“ was possible and that the UK would be ”working expeditiously over the coming days to seek those further assurances I believe MPs will need.“

But Labour leader Jeremy Corbyn said her deal was now ”dead in the water“ and the prime minister had ”utterly failed in her attempts to deliver any meaningful changes.”