He is most widely known for his opposition to immigration, especially Muslim immigration, and rejects the scientific consensus on climate change. He believes immigration policy to be the single most important political issue facing Norwegian society. In 2014 he released his book about immigration politics titled "Mens orkesteret fortsetter å spille" (While the orchestra continues to play). In 2018 and 2020 he put forward U.S. President Donald Trump's name as a candidate for the Nobel Peace Prize; any member of parliament may propose candidates.