Ministers do not need to ask permission from Northern Ireland, Scotland or Wales before triggering Article 50, the Supreme Court has ruled.
The UK's most senior judges said the Government was not legally compelled to consult devolved legislatures.
Christopher Stalford, DUP said: “I’m pleased that the court ruling gave clarity around the issues of devolved institutions and the remain fanatics in Sinn Fein and the SDLP have been given their answer, they will not have the power to block the decision that was taken by the British people in the Referendum, and I think that is welcome.”
The Government lost its appeal on Tuesday after arguing it did not need to seek a Parliamentary vote on starting the Brexit process. A bill is thought to be heading to Parliament later this week.