He was a Member of the Folketing (MF) from September 1994 until July 2022,[1][2] first representing Fremskridtspartiet until 6 October 1995 and then the DPP from that date until 29 June 2022,[3][4] when he became an independent.

[5] He became leader of the Danish People's Party in 2012, following Pia Kjærsgaard's retirement from the post.

[3][6] In 2012, after Pia Kjærsgaard's resignment, he was elected chairman of the Danish People's Party.

In 2014, a poll of Danish right wing voters showed that Thulesen Dahl was more popular as a possible candidate for Prime Minister than any other leader of the Danish right wing parties, including current Prime Minister Lars Løkke Rasmussen.

In the same interview, he declared himself a supporter of freedom of religion, thus a Dane who wishes to convert to Islam is free to do so, however, he also stated that he believes that there is no room in Denmark for more people with a Muslim background.