European Commission President Jean-Claude Juncker (R) poses with British Prime Minister Boris Johnson prior to a meeting at a restaurant on September 16, 2019 in Luxembourg.Pool | Getty Images News | Getty ImagesNegotiators from the U.K. and EU have reached a draft Brexit deal in the eleventh hour of talks and ahead of a crucial EU summit on Thursday.Sterling rose on news after the U.K. made concessions over the Irish border, an issue that had proven to be the biggest obstacle to a deal up to that point. The pound was 0.8% higher against the dollar, at $1.2929, reaching a five-month high.U.K. Prime Minister Boris Johnson said “we have a great new Brexit deal” via Twitter. He called on British lawmakers to back the deal when it’s put before Parliament on Saturday.Meanwhile, European Commission President Jean-Claude Juncker said the deal was a “fair and balanced” one.Discussions to hammer out a “Withdrawal Agreement” — that will now be put before EU leaders at their summit on Thursday and Friday, and then U.K. lawmakers at the weekend — had continued late into the night Tuesday and into Wednesday. The EU Parliament will also have to ratify the deal at an, as yet, unspecified date.U.K. Prime Minister Boris Johnson is legally bound to request an extension to the current Brexit departure date of October 31 if no deal is reached, or rejected, by October 19.Whether the deal will be approved in Westminster is in doubt, however, with the future status of Northern Ireland still a sticking point for some.A key ally of the government, the Northern Irish Democratic Unionist Party (DUP), has already responded by saying that it cannot support the deal.The U.K. government, which does not have a majority in the British Parliament, needs the DUP’s support (and votes) if it is to have a chance to get a deal over the line when (and if) Parliament votes on Saturday to approve any deal.The DUP said in a statement earlier Thursday that it’s unhappy with proposed customs and consent arrangements (designed to give Northern Ireland a say over its relationship with the EU post-Brexit) within the proposals. The DUP has repeatedly opposed any plans that would see it treated differently from the U.K. after Brexit.It’s unclear whether the Brexit deal struck between the EU and U.K. contains the same proposals or whether more concessions have been made.While details of the new deal remain scant, the U.K. opposition Labour party said in a statement that “from what we know, it seems the Prime Minister has negotiated an even worse deal than Theresa May’s, which was overwhelmingly rejected.”British MPs had rejected a Brexit deal arrived at by previous Prime Minister Theresa May three times because of objections to the Irish “backstop” issue. This was designed to prevent a hard border on the island of Ireland if the U.K. and EU can’t agree a trade deal in a 21-month transition period.