He served one term in the Regional Council of Provence-Alpes-Côte d'Azur until 27 June 2021.

Aubert held one of the council's vice presidencies from 13 December 2015 to 18 June 2017 under Christian Estrosi and Renaud Muselier.

Aubert served as deputy secretary-general of The Republicans from 13 December 2017 to 23 October 2019 under the leadership of Laurent Wauquiez.

He placed second in the 2019 The Republicans leadership election, in which he ran to the right of winner Christian Jacob.

[3] He lost his seat in the 2022 French legislative election to Jean-François Lovisolo of Ensemble.