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DUP MP Gavin Robinson asked if the government would consider taking steps to "either exempt Northern Ireland from EU action or take retaliatory action if they do not".

Sinn Féin has accused the DUP of blocking the executive from resolving a funding crisis for cross-border Irish language services, which are facing a £650,000 cut.

The finger of blame is being pointed at DUP Deputy First Minister Emma Little-Pengelly for refusing to allow the matter to reach the executive.

In an email to his supporters over the weekend, the DUP leader said the signage decision was now being challenged around the executive table.

It is understood DUP Communities Minister Gordon Lyons has posed a series of questions about the move in a letter to the infrastructure minister.