A Belfast Superior Court judge dismissed Brexit court action without a deal.
One of the three lawsuits filed by victim campaign was Raymond McCord, who plans to appeal the decision.
The Court heard arguments that a transaction would not have a negative effect on the peace process and threaten the Good Friday Agreement.
But the judge said the main aspects of the case were "inherently and unmistakably political".
- Judges rule suspending Parliament is illegal and Scotland. The current five-week suspension of Parliament, a process known as prophecy, began in the early hours of Tuesday.
On Wednesday, the highest civil court in Scotland ruled that Parliament's suspension was illegal.  Analysis: A line drawn between politics and law
by Chris Page, correspondent for BBC News, Ireland
The judge's verdict is essentially that the question he is asked to rule on. it has to deal with politicians, not the courts.
Lord Justice McCloskey stated that "almost all the evidence collected belongs to the world of politics."
But when cases in England and Scotland directed to the United Kingdom Supreme Court, Raymond McCord and his attorneys think that problems with Northern Ireland should be addressed there as well.
Following Thursday morning's hearing, Mr McCord's lawyer Ciaran O & # 39; Hare said that in the absence of a Stormont CEO, the most important way in which Northern Ireland can have a voice is for people to take action through the courts.
The United Kingdom Government's Supreme Court appeal against the decision will be heard by the Supreme Court of London next week.
Lord Justice Bernard McCloskey added that courts must "respect certain boundaries."