2018 Territoire de Belfort's 1st constituency by-election
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| Turnout | 29.51% 20.23% (first round) 28.91% 15.35% (second round) | ||||||||||||||||||||||||||||||||||||||||
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The first round of a by-election was held in Territoire de Belfort's 1st constituency on 28 January 2018, with a second round on 4 February because no candidate secured a majority of votes in the first round. The by-election was called due to the invalidation of the election of Ian Boucard, candidate of The Republicans (LR), in the June 2017 legislative elections by the Constitutional Council on 8 December 2017, due to the distribution of misleading electoral leaflets by Boucard's campaign between the two rounds.
The by-election was the first since the election of Emmanuel Macron as president, and marked the first confrontation between The Patriots and the National Front (FN) since Florian Philippot quit the FN to found his own party.
In the first round on 28 January, Ian Boucard of The Republicans and Christophe Grudler of the Democratic Movement (MoDem) advanced to the second round, as they did in June 2017, with Boucard securing a far higher percentage of votes amid low turnout. Boucard won the second round of the by-election on 4 February by a margin of nearly 18 points.