SINN Fein has branded as “absolutely bizarre” Arlene Foster’s description of her Brexit red line as blood red, claiming the DUP leader has “lost the run of herself”.

Sinn Fein vice president Michelle O’Neill accused Foster of being “out of touch” after the former Stormont First Minister made clear she would not support any increase in regulatory checks across the Irish Sea as a means to break the deadlock over the Irish border.

The DUP leader said: “The red line is blood red, it is very red.”

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Foster has also insisted Theresa May needs to show her any new proposals on the Irish border before presenting them to the EU, but she declined to state whether her party would vote against the Government if she considered any proposals unacceptable.

Her comments came amid reports the Government was considering allowing more regulatory differences between Northern Ireland and the rest of the UK to ensure a free-flowing Irish border is maintained on the island.

O’Neill said Foster’s remarks at the Tory conference in Birmingham showed the DUP was not speaking for the majority view in Northern Ireland, which voted Remain.