On Tuesday night, Richard Jomshof (SD), who chairs the Justice Committee, posted on Twitter:
"Gang crime and organized crime are largely an imported problem. Swedes are becoming a minority in their own country. There is an ongoing Islamisation. It's not conspiracy theories but facts."
The tweet has provoked strong reactions, including from Member of Parliament Ardalan Shekarabi (S).
"The conflict we have in this area is between law-abiding citizens and gang criminals. Not between people who have Swedish roots and those who have roots in other countries, he says in Sweden meet.
The scientist: "People's exchange" is a conspiracy
The fact that the Swedish population is being replaced by Muslims is a well-known conspiracy theory according to researcher Christer Mattsson, associate professor of education at the Segerstedt Institute at the University of Gothenburg.
"People have not come here to replace Swedes with non-Swedes. They have come here because the world is very unequal. People come here to get better living conditions and we have had a migration policy that has allowed this, says Christer Mattson to Göteborgs-Posten.
Åkesson: Pure mathematics
Party leader Jimmie Åkesson (SD) comments on his party colleague's tweet like this:
"It is obvious that we have a demographic change in Swedish society that has happened very quickly. For me, it's pure math. Then you can think it's good or bad. We think it risks having serious consequences for society, he tells SVT Nyheter.
Watch the debate in Sweden meet on SVT Play.