Norway Progress Party announced it was leaving the right-wing coalition government over the repatriation of an alleged Islamic State member and her two children last week.
“We don’t compromise with people who have voluntarily joined terror organisations,” party leader Siv Jensen told reporters in Oslo.
“We don’t get enough of the Progress Party’s policies through,” Jensen added.
Without the Progress Party, the coalition, headed by Prime Minister Erna Solberg, loses its majority in parliament, but she will still remain in charge.
While announcing her party’s decision, Jensen said it was “natural” that Solberg would remain Prime minister.
The 29-year-old Norwegian woman of Pakistani origin, was married to an Islamic State fighter.
The Progress Party had been in favour of bringing back the children but opposed her return, but all of them the mothere and her two children were repatriated to Norway on humanitarian grounds. The other three parties making up the coalition government ignored the objections of Progress Party and approved it.
The woman is accused of being a member of both the Al-Nusra Front and the Islamic State and was arrested by arrival.
Her five-year-old son and three-year-old daughter, born to different jihadist fighters, have been hospitalised.