His plan, which would need to be agreed by EU leaders at a summit next week, would allow the UK to leave sooner if Parliament ratifies a deal.

The UK's Conservatives and Labour Party are set to continue Brexit talks later.

Theresa May has written to Mr Tusk with the UK's request for a further delay to Brexit until 30 June.

The UK is due to leave the EU on 12 April and, as yet, no withdrawal deal has been approved by MPs.

Downing Street said "technical" talks between Labour and the Conservatives on Thursday had been "productive" and would continue on Friday.

Attorney General Geoffrey Cox has told the BBC that if they fail, the delay is "likely to be a long one".

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