Andersson describes the revelation as "a serious security crisis", and says the prime minister is obliged to answer "relevant questions".
What measures is Ulf Kristersson taking to protect Swedish interests?, she says in a speech on Saturday in Bredäng in Stockholm.
According to the chairman of the defence committee, Peter Hultqvist (S), Prime Minister Ulf Kristersson should be called to an extraordinary meeting of the committee due to the revelation. On Friday, Kristersson said that he "of course" would not attend such a meeting.
Hultqvist also wants an investigation by Säpo - and for Gustav Gellerbrant and his partner to be banned from the Riksdag and the Government Offices.
What has been revealed is deeply worrying and the longer time goes by without the Prime Minister responding, even more questions are raised about these people, Hultqvist says at a digital press conference on Saturday.
The magazine Expo revealed on Thursday that an SD official - a woman who moved from Russia to Sweden in 2006 - had for ten years spread articles and posts with Russian narratives from Russian state agencies and the news service RT, as well as from other channels known for Russian propaganda and disinformation. She also allegedly praised Russian President Vladimir Putin.
The woman - currently on parental leave - is living with Gustav Gellerbrant, who is a senior SD official at the Government Offices. He is the SD's head of the coordination office where all important issues in the Tidö Agreement are negotiated.
