London — UK Prime Minister Theresa May is hoping to restart stalled Brexit negotiations with her chief political rival, Jeremy Corbyn, in her search for a compromise plan she can sell to European leaders at a crucial summit this week. At the weekend, May defended her decision to work with the main opposition Labour Party leader to help draft a new blueprint for leaving the EU. Despite their differences, she warned that without Corbyn’s support, Britain might never leave the trading bloc. But the talks appeared to be stuck on Sunday night, with no further meetings planned for Monday, according to two people familiar with the matter, speaking on condition of anonymity. “The choice that lies ahead of us is either leaving the EU with a deal or not leaving at all,” May said in a video message released on Sunday. “People didn’t vote on party lines when it came to the Brexit referendum and, you know, I think often that members of the public want to see their politicians working together mo...

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