An MP from the borough has stepped down from her post as a junior shadow minister after voting against an amendment on a second Brexit referendum.
The first would be to get the a deal on the Withdrawal Agreement and then have a short extension while the second would be a longer period to sort out Brexit, he explained.
"She's been working tirelessly to deliver a deal and she will continue to do that", her spokesman said.
Selmayr also raised his doubts that May would be precise in her request, adding "she never has been before".
Talks are continuing with the Democratic Unionist Party, which said there were "still issues to be discussed" with ministers about the deal and the contentious Irish backstop measures.
Even if May manages to pull victory from the jaws of defeat, she already appears to have waved the white flag as regards her long-planned ambition of the United Kingdom leaving the European Union on March 29.
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She needs 75 lawmakers to change their vote.
Protesters plan to set out Saturday from Sunderland, which is 270 miles (434 kilometers) north of London that voted by 61-39 percent in 2016 to leave the EU.
The vote means United Kingdom may not now leave on 29 March. Mrs. In one unusual episode Thursday, Brexit Secretary Stephen Barclay urged Parliament to support the government's motion to seek a Brexit delay-then voted against it himself.
European Union leaders will consider pressing Britain to delay Brexit by at least a year to find a way out of the domestic maelstrom.
Professor Iain Begg, of the European Institute and co-director of the Dahrendorf Forum at the London School of Economics and Political Science, said: "EU agreement is likely, but the EU side will want reassurance that the extension is for a objective, not just to permit further procrastination by the UK". The full complement of presidents and prime ministers have not formally discussed this option together, and with populist Euroskeptics expected to make big gains in May's European Parliament elections, some leaders are anxious that Brexit could continue to "pollute" the EU agenda. In the event of an extension, the question is how long it will be. The argument now is really about what that new deal would look like, and with the extension of Article 50, they have a little more breathing space to process it.
Following a vote by MPs to allow an extension to Article 50, the European Council president Donald Tusk met Dutch Prime Minister Mark Rutte in The Hague on Friday, ahead of talks with Angela Merkel and Emmanuel Macron on Monday.