Jansen assisted
Forum for Democracy when it transitioned into a political party in 2016. At that point, the organization had already been in existence as a think tank for a number of years. That same year, he also joined Forum for Democracy's caucus in the
House of Representatives. When Forum for Democracy received a plurality of the votes in the
2019 provincial elections, Jansen co-wrote Baudet's victory speech. He also ran for
Member of the European Parliament in the
2019 election, ranking sixth on the
party list, but he was not elected due to FvD winning three seats. It was revealed the following year that Jansen had helped arrange a controversial 2017 meeting between Baudet, Jansen, white supremacist
Jared Taylor, and the Dutch
alt-right association Erkenbrand. Besides, news magazine
HP/De Tijd reported that his former superior at the Westland local council had written in a statement of defense for a labor dispute that Jansen had downplayed
the Holocaust and had lauded the economic policies of
Nazi Germany. Forum for Democracy called the statements "ridiculous and defamatory".
Extremist messages and 2021 general election In April 2020,
HP/De Tijd published an article about members of Forum for Democracy's youth wing being worried about
right-wing extremist ideas that were expressed in
WhatsApp group chats. In response, three members were expelled due to unacceptable statements and another three were suspended. The youth wing also expelled at least five whistleblowers. Forum for Democracy announced in October 2020 that Jansen would be the party's seventh candidate in the
2021 general election. Forum for Democracy politician
Annabel Nanninga called the youth wing's response "too little too late" and called for the division to be reorganized, while Baudet continued to express his support for Jansen. Shortly after, Forum for Democracy announced that Jansen had given up his spot on the party list for the 2021 election. After a number of prominent FvD members had left the party because of the controversy and Baudet had retained control over the party, a new party list for the 2021 general election was presented in late December. Jansen returned as the party's seventh candidate, and he was elected in March with 4,331
preference votes. Thierry Baudet and
Theo Hiddema stated that they were among the people who had voted for Jansen.
House of Representatives Jansen was sworn into the
House of Representatives on 31 March 2021. In the House, his specialities are education, youth, climate, innovation, digital affairs, and defense, and he is on the Committees for Defense, for Digital Affairs, for Economic Affairs and Climate Policy, for Infrastructure and Water Management, for Kingdom Relations, for Public Expenditure, and for Social Affairs and Employment. Jansen stayed on as chair of the Forum for Democracy youth wing until September 2021, and he joined FvD's board as treasurer in November. He has advocated expanding the military, saying that spending on it should far exceed the
NATO norm of 2% of GDP. Jansen was reprimanded in October 2022 by the House of Representatives for refusing to disclose his position as board member of publisher Amsterdam Media Group, while Baudet was suspended. The House's integrity body advised the following year to suspend Jansen along with Baudet and
Van Meijeren for one week for omitting roles at a meal-kit delivery service on their disclosure forms. In early 2022, Jansen declined a seat in the
States of Overijssel, which was offered to him as there was a vacancy and he had been FvD's in the
2019 provincial elections. Jansen accepting the seat would have compelled him to relocate to the province. Jansen received a second term in the House after he was
re-elected in 2023 as Forum for Democracy's second candidate. Although the replacement was intended to last six months, Van Houwelingen stayed on as a member of parliament. Jansen was Forum for Democracy's second candidate in the
June 2024 European Parliament election, but the party did not secure any seats. == Political views ==