Following the second round of the 2017 legislative election in Loiret's 4th constituency on 18 June, Mélusine Harlé, candidate of La République En Marche!

In addition, article L. 49 of the electoral code prohibits candidates from distributing electoral materials starting from midnight the day before the election, and Harlé argued that a Facebook post made by Door depicting a speech in his capacities as mayor of Montargis commemorating the Appeal of 18 June, as well as a post made by deputy mayor Fabrice Bouscal noting that he voted for Door and inviting voters to "choose the experience faced with adventure", were in breach of the article.

[13] Mélusine Harlé, a 45-year-old CEO of a management company and candidate of La République En Marche!,[5] launched her campaign on 13 January 2018 alongside party president Christophe Castaner,[14] against the backdrop of motorcyclists protesting the government's reduction of speed limits on local roads from 90 km/h to 80 km/h.

[18] Ludovic Marchetti, a 31-year-old pastry chef,[5] municipal councillor of Amilly, and departmental secretary of the National Front (FN) in Loiret, was again selected as the party's candidate in the constituency.

[20] Franck Demaumont of the PCF also initially intended to run,[21] before reversing his decision and Bruno Nottin was nominated in his place, with Françoise Causse of La France Insoumise selected as his substitute.

[22] Nottin, a 43-year-old court clerk,[5] received the support of Europe Ecology – The Greens (EELV),[23] which was initially considered likely to present its own candidate.

[26] Jalila Gaboret, a 45-year-old secondary school teacher,[5] was again announced as the candidate of the PS on 27 January,[28] and received the support of Olivier Faure, leader of the New Left group in the National Assembly, at a public meeting in Ingré on 19 February.