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German Chancellor Angela Merkel has said it's down to the UK to come up with an alternative to the Irish backstop in the next 30 days.
Prime Minister Boris Johnson accepted the challenge, but can it be done?
The backstop aims to prevent a hard Irish border after Brexit and has been a key Brexit sticking point.
Chief correspondent David Grossman reports from Berlin.
And Daniel Hannan, Conservative MEP and a leading figure in the Leave campaign and Sir Simon Fraser, former head of the diplomatic service who since leaving has spoken in favour of remaining in the EU, discuss the path ahead.