The spokesman said that unless there was an agreement based on "real compromise and movement by the Government" then the WAB would be "based on the same botched Brexit deal that has been rejected three times already by Parliament".
Britain can not leave the European Union with a deal if it does not pass the bill to ratify the agreement.
Asked which way she would be voting in the European elections the Telford MP said: "As a Conservative Member of Parliament I will support all candidates standing on a Conservative manifesto".
Steve Barclay acknowledged that the vote on the Withdrawal Agreement Bill would mark the end of the road for the deal struck between Mrs May and the European Union a year ago unless the government could muster a majority.
"The Prime Minister's team agreed to bring back documentation and further proposals tomorrow". "It is the same thing again, again and again".
It does have the feel of end of days for Theresa May as prime minister.
"And of course it would absolutely split the Conservative Party".
Asked if she would resign if the bill was defeated, May told reporters she was sure Members of Parliament (MPs) would keep in mind to respect the referendum result.
What is the Withdrawal Agreement Bill?
Jury awards couple $2B in Roundup weedkiller cancer case
Bayer released the following statement in reaction to a jury verdict in favor of the plaintiffs in the case of Pilliod v. It also remains to be seen how juries in other part of the country react to the evidence in upcoming trials, he said.
An anti-Brexit protester walks outside the Houses of Parliament in London, Britain May 15, 2019.
No 10 would not put a timeframe on publishing the bill, which MPs would expect to happen before the Whitsun recess at the end of next week, but it insisted the vote would happen that week.
Before her deal was defeated the last time, by 344 votes to 286 on March 29, May had promised to resign if it was passed.
Mrs May addressed MPs at Prime Minister's Questions today after revealing MPs would vote on a Brexit deal again next month.
The Scottish Conservative leader said the local authority results were a message to both the Tories and Labour after they failed to reach a deal on leaving the EU.
"If the prime minister brings the withdrawal bill to the Commons for a vote, the question will be "what has changed"?" asked Nigel Dodds, parliamentary leader of the Northern Irish Democratic Unionist Party (DUP), which props up May's minority government. The proposed Northern Ireland backstop, she wrote, was not what the British people voted for, and threatened to break up the United Kingdom.
May's spokesman declined to confirm explicitly that the prime minister would see it as the last act of her premiership if she were to lose the vote at the bill's second reading, but said May understood its significance.
As positions harden in parliament, with many wanting to either leave the European Union without a deal or to stop Brexit altogether, May has turned to the opposition Labour Party, led by veteran socialist Jeremy Corbyn, to negotiate a way out of the impasse.
Ms Davidson, who has just returned from maternity after having her first child, said it was "pretty disappointing" some of her English colleagues seem to be "sitting this one out" as they face a bruising from the Brexit Party.
Some 13 former ministers, together with the chairman of the backbench 1922 Committee, Sir Graham Brady, have written to the Prime Minister urging her not to concede Labour's key demand. "It's not possible to give a firm prediction of how long that will take", the spokesman said.