One of the Progress Party's most controversial figures has warned that Norway's immigration policy threatens to destroy the country's culture, putting the party's coalition negotiations under new strain.

Christian Tybring-Gjedde, who heads the party in Oslo, refused to renounce the phrase "creeping Islamization", which was used by party leader Siv Jensen in 2009.

"Creeping or not, it is Islamization that I totally renounce," Tybring-Gjedde said. "If it is the phrase 'creeping islamisation' that they do not like, we can call it 'adaptation to Islamic culture based on Sharia law.' Maybe those are words that will make it more acceptable for the Christian Democrats to talk to us."

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