In
2017, Roussel was elected to succeed Bocquet as the
Member of Parliament for the
20th constituency of
Nord as a member of the
French Communist Party. He became party leader in 2018. On 9 May 2021, Roussel won the Communist nomination for the
2022 presidential election. He was defeated in the first round of voting, placing eighth and garnering just 2.28% of the vote, the second-lowest vote share the party has ever managed in a presidential election. He was re-elected in the
2022 legislative elections as a deputy for the 20th constituency of Nord. In September 2023, Fabien Roussel had launched a call "to invade gas stations and supermarkets" , considering that it was "self-defense" in the face of rising prices. In response to rising costs of gasoline and food, Roussel stated: "We are being fleeced, attacked, racketeered, and we should say nothing? There are concrete measures to implement to lower prices, block them at the bottom... We are calling for mobilization, to invade gas stations, supermarkets, prefectures, because the State is responsible. It is a question of self-defense." These statements earned him denunciation from
Jean-Luc Mélenchon. In 2023, La France Insoumise deputy
Sophia Chikirou compared Roussel to
Jacques Doriot, a French communist who was later expelled from the Communist party and became a fascist collaborator with Nazi Germany. Jean-Luc Mélenchon reposted this comparison on Facebook. In November 2023, he announced that "The PCF has definitively broken with La France Insoumise" and ended participation of the PCF in the
NUPES alliance. In 2024, Roussel was defeated by the
National Rally candidate
Guillaume Florquin in the first round of that year’s
snap elections, his seat had been held by PCF since 1962. Roussel blamed his participation in
New Popular Front alliance together with La France Insoumise for his loss. He claimed: "The alliance, as it was built, does not allow us to win. It allows for big scores in the big cities, but small ones in rural areas and in the sub-prefectures. It even made people vote for RN!". He confirmed, that if he had to run again, it wouldn't be in an alliance with La France Insoumise. ==Political positions==