The officials spoke to The Associated Press on condition of anonymity to discuss the closed-door negotiations.
May agreed the delay in the early hours of the morning at an European Union summit in Brussels, ending the risk that Britain would leave the bloc without a deal on Friday but providing little new information on how she will resolve the country's biggest political crisis in more than 70 years. Last month, European Union leaders gave Britain until this Friday to approve a withdrawal plan, change course and seek a further delay to Brexit, or crash out of the European Union with no deal to cushion the shock.
This late-night agreement had not only ruled out the possibility of a no-deal Brexit, also offered PM May more than three-months she asked before the summit.
But with United Kingdom lawmakers expressing an unwillingness to endorse the Brexit deal that May has forged with the bloc, preparation for European Union election campaign has begun in order to fill 73 British seats in the 751-seat European Union legislature.
If the British government truly believes in democracy then they must ensure that everyone gets the vote not only those who have lived outside Britain for less than fifteen years.
He now hopes to transform Prime Minister Theresa May's failure to complete the split by its original March 29 deadline into big gains for Brexit supporters.
Tottenham: les nouvelles ne sont pas bonnes pour Kane
Autre coup dur pour le club londonien qui doit aussi négocier avec une blessure à la main de Dele Alli. Par ailleurs, le milieu offensif Dele Alli s'est lui fracturé la main gauche lors de cette rencontre.
Even though May technically has until October 31, other dates before then could play into the UK's departure.
The extension at least provides more time for May to break the logjam, though it could easily just prolong the national agony.
Most of the other 27 members of the European Council either lead coalition governments or must deal with other power-sharing arrangements, while cooperation of any sort between Labour and May's Conservatives in peacetime is vanishingly rare - although May was part of a Conservative coalition with the smaller Liberal party in 2010-15.
May retorted: "I think you know the answer to that".
Presenter Robert Peston said of his interview with Mr McDonnell: "It is clear to me Labour is close to upgrading the referendum idea from option to formal first-choice policy". He angered them again recently by describing another Brexit referendum as a "perfectly credible proposition".
Pro-EU politicians said the next few months should be used to hold a new referendum on whether to leave the EU or remain. This has forced the debate to happen against the backdrop of a deadline and cliff-edge that has made it possible for the government to threaten, "it's our deal or no deal", or "it's our deal or a long delay", making it more into a game of chicken than a country trying to forge the right road ahead.
Addressing British lawmakers in parliament Thursday, Prime Minister Theresa May renewed calls for compromise.