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A challenge to the legality of the Northern Ireland protocol is due to begin at the High Court in Belfast on Friday.
The protocol is the part of the Brexit deal which creates a trade border between Northern Ireland and Great Britain.
The judicial review has been brought by unionist political leaders.
They say the protocol breaches the Act of Union and the 1998 Good Friday Agreement.
The protocol means Northern Ireland remains a part of the EU’s single market for goods and enforces EU customs rules at its ports.
However, since January it has led to