This has historically happened very rarely, as members of the Folketing who risk ending up in the situation often withdraw themselves.
If they do not, the matter must be considered by the Election Review Committee. And finally, it will be put to a vote in the Folketing.
Read here when it happened:
* Arnold Chr. Normann, 1972:
The radical politician Arnold Chr. Normann was voted out of the Folketing in 1972. Among other things, he had been Minister of Fisheries and Minister of Greenland.
In September 1971, he collided during an overhaul with another car at Kvistgård in North Zealand. Two were killed and three injured in the accident for which he had the main responsibility.
In the autumn of 1972, he was denied in the Eastern High Court the right to drive a car for two years and 30 days’ imprisonment.
In November of the same year, he was voted out of the Folketing by 88 votes to 70. Five abstained.
* Mogens Glistrup, 1983 and 1984:
The charismatic lawyer Mogens Glistrup and leader of the Progress Party were voted out of the Folketing in 1983 and 1984.
Mogens Glistrup founded the Progress Party, which entered the Folketing in the landslide election in 1973 with 28 seats.
For several years, Mogens Glistrup had told how he avoided paying taxes. In 1983, however, after a lengthy trial, he was sentenced by the Supreme Court to three years in prison for tax fraud.
He was voted out of Parliament on 1 July 1983 by 128 votes to 22, with 29 abstentions.
Mogens Glistrup had voted out, but had not lost the right to stand again. Therefore, he ran from prison until the election in January 1984, where he was elected.
He could therefore – with his immunity as a Member of Parliament – leave prison on 16 January. As early as 6 February, however, 139 members of the Folketing voted to declare Glistrup’s election invalid. He then had to return to prison.
* Hugo Holm, 1990:
Hugo Holm entered the Folketing for the Progress Party in 1988 as a deputy for Pia Kjærsgaard, who had been involved in a traffic accident. Subsequently, he replaced another member permanently. In 1989, he became a non-attached member after internal conflicts.
Hugo Holm was sentenced in 1990 to six months in prison for violence, attempted fraud, false reporting and drink-driving.
He became so after a bizarre episode in 1989 in which he accused a couple he had given a lift of having stolen a large amount of cash from him.
He then beat one member of the couple and reported the theft to his insurance company. In December of the same year, he was taken for driving with a blood alcohol level of 1.92.
A unanimous Folketing voted him out of the Folketing in November 1990.
Sources: Folketingstidende, Ritzau, Danish history.