He has been Member of the Riksdag since September 2018, representing the constituency of Västra Götaland County East for the Sweden Democrats party.

[3] In 2015, he ran for chairman of the SDU against Jessica Ohlson and was seen as a more moderate candidate but narrowly lost the election.

In August 2022, Andersson received criticism from the leaderships of the Centre Party and Swedish Liberal Party leader Johan Pehrson after he Tweeted a picture of a Stockholm Metro train on which the SD had paid to feature a campaign advertisement with the caption "Repatriation train.

Next stop Kabul!” SD leader Jimmie Åkesson denied that Andersson's comment was intended to be racist.

[6] Andersson later elaborated in an interview that his Twitter post had been a sarcastic response to people who claimed to be offended by the SD's subway advertising and were calling for it to be removed.