The far-right Swedish Democrats party will report Prime Minister Stefan Löfven to the parliament’s constitutional committee for using the term “Nazis” to describe them.

The Constitutional Committee is bipartisan and has the mandate to scrutinize the government and inform the parliament (Riksdag) whether the constitution is upheld and can decide whether a member of the cabinet can be prosecuted.

Löfven called the Swedish Democrats “a Nazi party” in a televised debate on Sunday. The Swedish Democrats suggest that being compared to Nazis shows a lack of respect for those exposed to real Nazism.

The Swedish Prime Minister was debating on public television, discussing the issue of possible electoral alliances. Shunning the Swedish Democrats from any coalition scenario, Prime Minister Löfven said this was “a Nazi party, a racist party,” and went on to suggest that when the current leader of the party, Jimmie Åkesson, joined the party “swastikas were still in use at the meetings.”

At that point, Åkesson called the Swedish Prime Minister a liar.

After the debate, Löfven told the Dagens Nyheter daily that Swedish Democrats had racist and Nazi “roots,” as it originated “from a white power movement.”

The Swedish Democrats (Sverigedemokraterna) were founded in 1988 by members of far-right right organizations such as the Nordic National Party, and the Bevara Sverige Svenskt (“Keep Sweden Swedish”).

Today, polls suggest their following continues to surge, riding a wave of anti-immigrant rhetoric across Europe.

Although the party claims to be a moderate conservative movement, last week the Swedish Democrat Member of Parliament Anna Hagwall told the Aftonbladet daily that “no family, ethnic group or company should be allowed to control directly/indirectly more than 5% of media.” She was referring to the Jewish Bonnier family, who own a big media conglomerate. The party announced the MP Anna Hagwall will resign and will not run again as a candidate for the party.

The Swedish Democrats are members of the Europe of Freedom and Direct Democracy group in the European Parliament, chaired by Nigel Farage and David Borelli of the Five Star Movement.