Prime Minister Theresa May will talk by telephone to EU president Jean-Claude Juncker on Friday at the British leader's request, EU officials said.

"President Juncker will talk to Prime Minister May today early afternoon at her request," European Commission spokesman Margaritis Schinas said.

"I don't know how decisive or not this will be." British politicians are now wrangling over how to get out of the impasse, which could see Britain crash out of the union without a deal on March 29.

EU leaders have so far ruled out renegotiating the agreement, but have signalled they could postpone the withdrawal if May comes up with a plan.

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